Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4b152c5396046d…

MALICIOUS

PDF

34.1 KB Created: 2020-08-30 05:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e287df20ce09e17c72716b787b1161 SHA-1: fbe5eb4c1af78dcfddd757fc3abb422a4f02a065 SHA-256: af4b152c5396046d369813aa5fae725dd084cbfd29e54d0c01fc2e8c8bd6f53c
152 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body contains numerous embedded URLs, forming a link farm, with the primary redirector being ttraff.com. This suggests a phishing or scam campaign aimed at directing users to malicious sites.

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.com/wix?keyword=9.+1+cellular+respiration+an+overview+answers
    • https://static.usrfiles.com/ugd/b8c837_41e7b55853824b1d8aa276587fab3c5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_26c040140da746da94db7265570021d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe4d9c8af72f41e586bcfa1bbda90240.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f2d6b9ecb524da2a609b22c7b26dafe.pdf
    • https://static.usrfiles.com/ugd/0aab01_056686bcdb854dedb60965516e7d663e.pdf
    • https://static.usrfiles.com/ugd/e3834b_31dd589836834d9bb853487c2b5db2bb.pdf
    • https://static.usrfiles.com/ugd/760101_a0961b7066e746adb7bc3df3c64f2782.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9fe9742dad456c8961b1dc3fe4173d.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/xewogibimerarujafoso.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/voice_chat_discord_servers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/gawofebem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/fundamentals_of_anatomy_and_physiology_martini.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/pujafimebowaluzezedes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/luxawawepozogolusafa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046d0.bin
3413c732164ad1aefc4f41851ab993882ac5c30d13e2dc9ce94d94361e075611
pdf-font-stream PDF embedded font (sfnt) at offset 0x46D0 5224 bytes
font_01_sfnt_off000058bc.bin
fe85c7a26569ccf4a73e702afd462c6b5017d31f6cd09c2721082b183b4d5ffd
pdf-font-stream PDF embedded font (sfnt) at offset 0x58BC 10152 bytes