Malicious PDF — malware analysis report

Static analysis result for SHA-256 627cb5805dd59dbb…

MALICIOUS

PDF

43.9 KB Created: 2020-08-06 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d85d4d2007bcdb10dea64554528d554 SHA-1: 60c59c857d19bdb497557501232243221eca574a SHA-256: 627cb5805dd59dbb26030e318d58fbc7881720177cbee346a2e046e1c3e6dfbd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise malicious content as a legitimate document. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=non+parametric+test+in+spss+pdf
    • http://files.workpurposefully.org/uploads/1/3/1/6/131606490/pavaloxoroge_pabasani.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://files.cateringandcreations.net/uploads/1/3/0/8/130814513/9295549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/40988127893.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/tifajoxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/76994623354.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/safine.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/classic_wow_prot_warrior_talents.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2786/files/fanax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/nisavezibugefaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/kobokobiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/kejijokofixinolejapixagit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/49264416677.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e78.bin
721a5c7c367ad9108d40a2dbfcd84d0538d2f2daa6106cdfcdf8398f41b9a903
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E78 5240 bytes
font_01_sfnt_off00008035.bin
624e9425539363f74847571adb20575fbf22d78b950b6511b8f76bad487b8379
pdf-font-stream PDF embedded font (sfnt) at offset 0x8035 10172 bytes