Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7d4f5afcfbc5f1…

MALICIOUS

PDF

54.8 KB Created: 2018-06-11 08:42:52 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 3cfa4cc2663755179b3999e8ff85fb17 SHA-1: dcefcddf49e76d2c226236457fc24c0c98e11f53 SHA-256: 1d7d4f5afcfbc5f16e72d687f104b9fbedb1dc50760dc3a50073cdfdf9b38e45
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.6138

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=wheelock-latin-workbook-answer-key.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=wheelock-latin-workbook-answer-key.pdfIn PDF document text
    • http://www.wheelockslatin.com/wheelocksteacherguide.htmlIn PDF document text
    • http://www.wheelockslatin.com/In PDF document text
    • http://www.wheelockslatin.com/wheelocksflashcards.htmIn PDF document text
    • http://www.wheelockslatin.com/chapters/introduction/introduction.htmlIn PDF document text
    • http://www.wheelockslatin.com/wheelockslinks.htmIn PDF document text
    • http://www.wheelockslatin.com/tutorials/home.htmlIn PDF document text
    • http://languagegeek.net/2007/07/05/wheelocks-latin-answer-key/In PDF document text
    • http://www.textkit.com/greek-latin-forum/viewtopic.php?t=1094In PDF document text
    • http://www.textkit.com/greek-latin-forum/viewtopic.php?t=890In PDF document text
    • http://riverside-resort.net/1/tuner-car-design-software.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-rmt-d10-universal-remotes-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sharepoint-2015-solution-management.pdfIn PDF document text
    • http://riverside-resort.net/1/sondheim-apos-s-broadway-musical.pdfIn PDF document text
    • http://riverside-resort.net/1/the-imovie-11-project-book-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-truth-about-muhammad-founder-of-worlds-most-intolerant-religion-robert-spencer.pdfIn PDF document text
    • http://riverside-resort.net/1/sex-and-science-economist.pdfIn PDF document text
    • http://riverside-resort.net/1/this-tender-melody-the-gentlemen-of-queen-city-book-1.pdfIn PDF document text
    • http://riverside-resort.net/1/tourism-pat-memorandum-2018-grade11.pdfIn PDF document text
    • http://riverside-resort.net/1/the-manning-brides-those-men-1-2-debbie-macomber.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.amazon.com/Workbook-Wheelocks-Latin-Paul-Comeau/dp/0060956429In PDF document text
    • https://www.amazon.com/books-used-books-textbooks/b?ie=UTF8&node=283155In PDF document text
    • https://www.amazon.com/Education-Reference-Books/b?ie=UTF8&node=21In PDF document text
    • https://www.amazon.com/Dictionaries-Thesauruses-Reference-Books/b?ie=UTF8&node=11475In PDF document text
    • https://www.reddit.com/r/latin/comments/3fjkjp/no_answer_keys_available_for_the_wheelocks_latin/In PDF document text
    • https://www.netgalley.com/catalog/book/6029In PDF document text
    • https://www.amazon.com/Workbook-Wheelocks-Latin-Paul-Comeau/product-reviews/0060956429In PDF document text
    • https://www.goodreads.com/book/show/283532.Workbook_for_Wheelock_s_LatinIn PDF document text
    • https://www.scribd.com/document/242631558/Wheelock-Answer-KEYIn PDF document text
    • https://0.r.bat.bing.com/?ld=d39DeLWYq5TpmVT3CGuS034zVUCUwGqtK4vDithee59d7MJi1LanuFfuHH4J-5f_MeW0lpHWhiMQr1scQmu-8nNnl6wec9qc4h8_9Ga6T1B76qzAHHHvu-I-LIaTwfK2t_R-Fq0cB_e8gNzE6mLQjaVWZudlzCGPHLI6nLY7vLCF_axWc4&u=http%3a%2f%2fwww.amazon.com%2fdp%2f0060956429%2f%3ftag%3dmh0b-20%26hvadid%3d77859219347574%26hvqmt%3db%26hvbmt%3dbb%26hvdev%3dc%26ref%3dpd_sl_10dmvx35bi_b&rlid=da3456fe76ee1cf94f130de4abf2fe1eIn 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://www.reddit.com/r/latin/comments/3fjkjp/no_answer_keysIn PDF document text
    • https://www.amazon.com/Workbook-Wheelocks-Latin-Paul-Comeau/In PDF document text
    • https://www.goodreads.com/.../283532.Workbook_for_Wheelock_s_LatinIn 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_off00008481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8481 14752 bytes
SHA-256: 6a1ce3eb114ed56363b2f95c14057c4d9ea19fc8ef89f177ba980e0cf9a9e76b
font_01_sfnt_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 10252 bytes
SHA-256: 58fe4bc969c9f0f95e320795bef970f9f8bb3c50703a9ae2a0c60d09598db4dc