Malicious PDF — malware analysis report

Static analysis result for SHA-256 978862879592dbb9…

MALICIOUS

PDF

99.6 KB Created: 2020-04-01 20:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db336cbf6181c40067d46309706867bc SHA-1: 6e6fd484913afebd0ba052fa2abc7fc88fec7f1e SHA-256: 978862879592dbb91a91db82f16f49f3742757c2de46acf6f12e4f73ed1fd064
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF_SEO_LINK_FARM heuristic indicates the document is designed to host a large number of external links. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs point to various domains, suggesting a coordinated effort to distribute content or redirect users to potentially harmful sites. No scripts were extracted, but the structure and heuristics point to a link-farming or redirection attack.

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://fftv.shop/uploads/1/3/1/3/131380771/131380771.html#andy+Birke+dubuque
    • http://coffeeatyouroffice.com/uploads/1/3/0/3/130323251/fonugez-rumuwuse.pdf
    • http://fairyvapestore.com/uploads/1/3/0/5/130542912/9960774.pdf
    • http://chrisbatchler.com/uploads/1/3/0/7/130775593/55e6aa1.pdf
    • http://lovenuggets.net/uploads/1/3/0/7/130739233/xafiralo.pdf
    • http://portlandwebsitedeveloper.com/uploads/1/3/0/6/130604758/352c9f990a4fee.pdf
    • http://mintpersonaltraining.com/uploads/1/3/1/3/131380471/nijirodupezugowadub.pdf
    • http://amcraftdesigns.com/uploads/1/3/1/4/131408917/fulagibuw.pdf
    • http://74-123-75-119.mgwnet.com/uploads/1/3/1/0/131070618/betizowufumegetefama.pdf
    • http://yoh-almo.com/uploads/1/3/0/6/130620356/b62dc66a.pdf
    • http://mnlifecoach.com/uploads/1/3/1/4/131406604/670eda1338d.pdf
    • http://floralstudio1796.com/uploads/1/3/0/2/130289641/d561dce66ca5d38.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160d7.bin
30359adfadcfb16efe38cb19eb5c43155b80cdaadaeb5b5ed5e9a74157f98acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160D7 8340 bytes

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