Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86799756767454f…

MALICIOUS

PDF

85.0 KB Created: 2020-10-04 05:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 40099df07776f81ceed71fb2bd8b9c18 SHA-1: 66c69f5975e193ad31a6fb7e244954f04a20bbc9 SHA-256: b86799756767454fde080b1a76b9c8492277cea5b25f3cd6b6b402dbc4a7c25e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The document body, though heavily obfuscated, contains a reference to this URL, suggesting it is the primary lure. The presence of multiple external PDF links further supports the classification as a link farm, likely intended for phishing or malware distribution.

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://cctraff.ru/strik?keyword=pillars+of+eternity+deadfire+map In PDF document text
    • http://files.purplehornpress.com/uploads/1/3/1/4/131453531/2af3cbbe79f9021.pdfIn PDF document text
    • http://gigimo.d20stitchery.com/uploads/1/3/2/6/132682866/zimamasupoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83c70cf-87fb-4aa2-8623-1f7a5a8a89fd/76319101304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20611a5c-c99c-4328-ae24-8b518002fb96/66270770643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41db6336-3ec2-483f-9c1e-0997bd65d720/vovowobamisifikomoxagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e624b64f-448f-4501-943b-7c93cf3da920/33953008021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4322a288-871b-4e50-b275-92b8305a3603/91718498211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3735ef4f-e3fa-4941-927a-9d6e61881160/4830945587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ef284d-d05b-45e1-b4f3-21bf86ead3a0/3773934860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/558f1c21-771e-43f5-bc1a-5a2d3a7c05de/kuwipamezunixosiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a498619b-f307-446c-a2b9-de872789cfd9/zuxikezip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 5288 bytes
SHA-256: e10b4c3ea0ef3db815fdb5f1367f685e1d746e572993f481fd27e2b833e77e8a
font_01_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 10324 bytes
SHA-256: db8a0c7c955006ebb75855ade7cbfbb2bc229d54388d618b4e108fd48a8beca6

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