Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d6dd44e7f2a715…

MALICIOUS

PDF

41.1 KB Created: 2020-06-20 14:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab36eae465525520dc0c0dfc2dc5a0b SHA-1: e7ef0408c8d85180a6fe27b76ee4c1c184a02c1b SHA-256: d3d6dd44e7f2a715b08b5041620b2c6c22221161729d1857e0094b5e03257b0f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to a 'Warrior maplestory guide' and includes several URLs that are likely part of this malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://verytraumatic.net/uploads/1/3/0/7/130776817/130776817.html#warrior+maplestory+guide
    • http://westoahucleaningllc.com/uploads/1/3/0/7/130776157/xoxubone_kanaroxate_bujazipumigiso.pdf
    • http://wendyjoyoils.com/uploads/1/3/0/7/130740368/918c575ce600.pdf
    • http://theteacherwellbeingproject.com/uploads/1/3/1/3/131380054/webujojew_jojolokom_xilawujax.pdf
    • http://mail.pocdogs.com/uploads/1/3/0/4/130483703/gikevilel_bojuvefo.pdf
    • http://mx.bentcopper.com/uploads/1/3/0/7/130740420/a9c2791873b.pdf
    • http://autoaccidentlawyerswtl.com/uploads/1/3/0/6/130622077/6568137.pdf
    • http://southamboyfirstaid.com/uploads/1/3/1/0/131070376/3638694.pdf
    • http://mail.browbeginnings.com/uploads/1/3/0/8/130815381/mofekud.pdf
    • http://grupo-ontiveros.com/uploads/1/3/2/7/132740338/1dddb0285fbe27.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_off000060b8.bin
c8983260b4d5bc85498965743ec5455442ef896b8e31c02ec2e03ef20483b2ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B8 5168 bytes
font_01_sfnt_off00007261.bin
45bd17844adf9db517769b9e56a1ce74a82f6879d4391b076af3646dccdf9273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 10540 bytes

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