Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1a6a4b6c7ec0c…

MALICIOUS

PDF

35.7 KB Created: 2018-06-11 09:59:01 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 6e246c6e377dd1ffa15d0b377436a6c4 SHA-1: 3735dcae3db8a13e3b8ccfe62a99b08de7589fb6 SHA-256: 88f1a6a4b6c7ec0c3f4e104417a785073a0c4bc888f763315b51471b67bb6e0c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by an ML classifier and exhibits characteristics of SEO poisoning and fake download lures. It contains multiple links pointing to 'uncpbisdegree.com', suggesting an attempt to redirect users to a malicious site for further exploitation. The document body, though partially garbled, also contains these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8870

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://uncpbisdegree.com/download3.php?q=the-teacher-who-forgot-too-much.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-teacher-who-forgot-too-much.pdfIn PDF document text
    • http://www.pickupartistmindset.com/flirting/how-to-flirt-with-your-teacher/In PDF document text
    • http://www.craftaholicsanonymous.net/12-reasons-your-wife-spends-too-much-at-hobby-lobbyIn PDF document text
    • http://www.michaelcorcoran.net/archives/1469In PDF document text
    • https://www.triedandtrueblog.com/teacher-survival-kit/In PDF document text
    • http://www.teachwombat.com/In PDF document text
    • http://teacherhabits.com/why-teachers-are-so-tired-and-what-to-do-about-it/In PDF document text
    • http://riverside-resort.net/1/when-insurers-go-bust-an-economic-analysis-of-the-role-and-design-of-prudential-regulation.pdfIn PDF document text
    • http://uncpbisdegree.com/1/storytown-schools-around-the-world-comprehension-test.pdfIn PDF document text
    • http://riverside-resort.net/1/universe-a-journey-to-the-edge-of-the-cosmos.pdfIn PDF document text
    • http://uncpbisdegree.com/1/tec-fs-2600user-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/smc-ez-switches-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-test-answers-sheet.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-r150-parts-catalog.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-gold-cadillac.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-considered-dramatic-weight-loss.pdfIn PDF document text
    • http://uncpbisdegree.com/1/seiko-suj797-watches-owners-manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://slatestarcodex.com/2016/05/19/teachers-much-more-than-you-wanted-to-know/In PDF document text
    • https://www.education.com/magazine/article/Ed_Academic_Preschools/In PDF document text
    • https://www.education.com/articles/Academic+Preschools%3A+Too+Much+Too+Soon%3F/In PDF document text
    • https://www.redtube.com/58038In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/TooMuchInformationIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/MySpeciesDothProtestTooMuchIn PDF document text
    • https://www.livestrong.com/article/280411-how-to-remove-too-much-salt-from-soup/In PDF document text
    • https://www.livestrong.com/scat/diet-and-nutrition/In PDF document text
    • https://www.livestrong.com/sscat/protein/In PDF document text
    • https://www.livestrong.com/article/529555-what-are-the-effects-of-too-much-spinach/In PDF document text
    • https://www.livestrong.com/sscat/nutrition-facts/In PDF document text
    • https://www.pbslearningmedia.org/In PDF document text
    • https://www.mindbodygreen.com/trainings/meditation-teacher-trainingIn PDF document text
    • https://au.ixl.com/signin/tyndaleIn PDF document text
    • https://www.literotica.com/s/pet-teacher-3In PDF document text
    • https://www.literotica.com/c/lesbian-sex-storiesIn PDF document text
    • https://xhamster.com/videos/hot-futanari-teacher-surprises-students-6430806In PDF document text
    • http://www.bbc.co.uk/worldservice/learningenglish/language/theteacher/2009/03/090311_teacher_animal_dog.shtmlIn PDF document text
    • https://www.pornhub.com/view_video.php?viewkey=ph5a0daf3c370f6In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F54 10632 bytes
SHA-256: 799d61d727828c4285ad0c399601fdcb0dcb6713181ae18a238e00ef10c15024
font_01_sfnt_off00007106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7106 6812 bytes
SHA-256: f68ea01d5dbe89835f22c477026b149703c09b01f23b0912f44dbba87aaa5400