Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af639e11a2c6e47…

MALICIOUS

PDF

71.5 KB Created: 2020-08-18 14:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c1cfa335e3a6d9197f54855086b090 SHA-1: cbb0bb25c677d6dc78cff730364e9fbf08f8bca2 SHA-256: 5af639e11a2c6e4765a71a4e584088da5cadafc622e161c467429b23be2dda9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=balancing+redox+reactions+worksheet+doc'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary redirector is suspicious. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.cc/pify?keyword=balancing+redox+reactions+worksheet+doc
    • http://files.audreytabor.com/uploads/1/3/1/1/131164476/47d963f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/29533651640.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/aristoteles_metafisica_libro_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/phase_5_phonics_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/wajedexigozulonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/japuxugonaxerimelukugozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/ansys_apdl_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/fekurenipodakovoke.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/68070280406.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/vanagokurugukozaji.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0293/files/wubanitud.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/minikipezejazabekenexowo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc1.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 2828 bytes
font_01_sfnt_off0000d9bb.bin
aa47691dd5b2815a096eb7e707b53b03038c00d050c156c862f5e48e29037ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 5472 bytes
font_02_sfnt_off0000ec59.bin
0624334168172f6bb45722fa1feecac5b734f9f3d8c53ad2a6abb492fac952b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 10000 bytes

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