Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff32d010899edbe8…

MALICIOUS

PDF

44.8 KB Created: 2020-11-08 00:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 6de3005e42e70c862813fa69650be56c SHA-1: 4763a28e60444326e6305e28c713749ef033fac7 SHA-256: ff32d010899edbe8e71313a5e3c53e842e7b4fa12dbb96eb6279fd33f0cb60fc
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://traffine.ru/123?keyword=bni+one+to+one+worksheet In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/maledipet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wanunukine.files.wordpress.com/2020/11/sniper_elite_4_waffen_verbessern.pdfIn PDF document text
    • https://baginalikut.files.wordpress.com/2020/11/tamirajinonupapabi.pdfIn PDF document text
    • https://s3.amazonaws.com/lojigevaxive/84029700381.pdfIn PDF document text
    • https://lazipawowuv.files.wordpress.com/2020/11/maths_formulas_download.pdfIn PDF document text
    • https://gibupobale.files.wordpress.com/2020/11/51603225466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3654f91-c976-47bc-bd8d-60861f4a9016/ffx_o_aka_donation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/boketobumejifu.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/28680549686.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/starry_starry_night_chords.pdfIn PDF document text
    • https://xevenupemo.files.wordpress.com/2020/11/samsung_j701f_combination_file_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/students_or_students_grammar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 4736 bytes
SHA-256: d99915c90a39d7c372c0a3306ad2adbedc784f232cba6f307cc6ee0fed2c0bf7
font_01_sfnt_off00006d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D64 10604 bytes
SHA-256: 12dab81bb623e170a9dbace016684663a9cd5f33150b690bcd74d9e4a9ba2766
font_02_sfnt_off000091ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91AD 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330