Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9ff29ecf4632b9…

MALICIOUS

PDF

41.9 KB Created: 2020-09-02 09:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db7fbe3aebf90116eb9f783ee7fb106c SHA-1: 3c95c36fb037a918503f3d25983435dd99621441 SHA-256: df9ff29ecf4632b9d1fc87a4b50977c4b72ad67766060790c37890f462b18e84
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links is sufficient to classify the attack pattern.

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.club/wix?keyword=acetone+msds+sheet+fisher+scientific
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/49412928733.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/jobipuxer.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/bujimadezunibivorilis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/filedujexitumo.pdf
    • https://static.usrfiles.com/ugd/930050_cd10900589354b9e92aef47aa5442f33.pdf
    • https://static.usrfiles.com/ugd/b6edda_65a28fe17c084eb8ad390ee5b7b478d4.pdf
    • https://static.usrfiles.com/ugd/0286dd_26c1393c0c78495794d4d1b6dc4e6535.pdf
    • https://static.usrfiles.com/ugd/289c5e_2b581d96237044d9bb9df411fab52375.pdf
    • https://static.usrfiles.com/ugd/fbccce_60a5b4df7a554a4191085c100ab8c831.pdf
    • https://static.usrfiles.com/ugd/b8c837_7af8bd65cb784c87af0e8e52cf512c72.pdf
    • https://static.usrfiles.com/ugd/93c935_5f92b560a0154118929eed2d506e4107.pdf
    • https://static.usrfiles.com/ugd/cafc24_3076a5d748c348e99fba86885faec257.pdf
    • https://static.usrfiles.com/ugd/7dd30d_66c689dc0fd044a59aeb053794fb8a3e.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_564c34229add489081bda04b106b009d.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_off00006776.bin
8c91a6e703606e0a68cfa835afd02529e35df173730175401a999263f4a69394
pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 5008 bytes
font_01_sfnt_off00007857.bin
ccbfd0cca3ac9a2da5eb18df9d86f194a197538a0a96550f3796fba834d0e64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7857 10192 bytes