Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e52164eb7ae4807…

MALICIOUS

PDF

42.9 KB Created: 2020-04-09 07:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc2db0acc8fa5f343ad4aef89b59c974 SHA-1: 557003b045aeeceed3531b572632bced1cecf676 SHA-256: 4e52164eb7ae48077901ba527e034af8e97289fe8c9dcbe1ffe61534166a93f4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many of which are SEO-optimized with numeric slugs, indicating a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious. The presence of multiple links to PDF files on various domains suggests an attempt to distribute or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://tropicaltrunks.com/uploads/1/3/0/7/130775268/130775268.html#sildurs+enhanced+default+shaders+1.14.4+download
    • http://janelleharris.com/uploads/1/3/0/5/130539105/suvan.pdf
    • http://patriotenationalrapidresponse.com/uploads/1/3/0/6/130621439/sipek.pdf
    • http://mail.fletcherspub.com/uploads/1/3/0/6/130620207/sixafonif-fiwoborobu.pdf
    • http://exercise-4life-online.com/uploads/1/3/0/7/130775125/2ee073699.pdf
    • http://futureforwards.org/uploads/1/3/0/8/130814297/5645583.pdf
    • http://sevencsmarketing.com/uploads/1/3/0/6/130620767/3a9efee7.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_off000065f7.bin
dd162b2ccd8cb42b0fe7b43ffc72e35c36634f327dba10d2f6adcacb7cc14812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 8840 bytes
font_01_sfnt_off000087ca.bin
81df44247aa6368ee4f5613fd77267ee6cd66bd9e993d06b683ce941502b9c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CA 16064 bytes

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