Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1e4ff433225ee1…

MALICIOUS

PDF

32.3 KB Created: 2020-06-17 04:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ae2295309da2bcfc07511d60c8857f SHA-1: 52c488f31d3ba999c087d70545485299ffbfb875 SHA-256: 4e1e4ff433225ee12ce192e5ddf8d2b4c9e32f356023f082d6d86d205a84dcff
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to a manual and the authoring application, suggesting a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mx.superdogdoodles.com/uploads/1/3/1/6/131606397/131606397.html#tuff+torq+k62+manual
    • http://gscareers.com/uploads/1/3/1/4/131437867/739665e65.pdf
    • http://groverclevelandhs.com/uploads/1/3/1/4/131437216/witesipaxasu.pdf
    • http://gangconsultancy.com/uploads/1/3/0/6/130605255/ronuwe.pdf
    • http://floraexpress.nl/uploads/1/3/0/8/130873810/3ef8478d8.pdf
    • http://74-123-72-187.mgwnet.com/uploads/1/3/0/4/130476628/filotume_mitev.pdf
    • http://danielgann.com/uploads/1/3/0/4/130493248/8836133.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_off00004398.bin
6c513db95184c04bcf07a7f21958d9ff0a5e6ca874e5aae387d2b4fa05a09c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4398 4876 bytes
font_01_sfnt_off00005415.bin
3c03e109f6e15b6a47d04b81c8a338f5214aad12e646dfcb5e4d0653476f38de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5415 9884 bytes

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