Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd0e1e078c6ca95…

MALICIOUS

PDF

31.1 KB Created: 2020-03-09 12:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d0f6a3870f28fb645d63d557bb89e1a SHA-1: b6e5cafe552a19a4c1da83138ced17a4f9279cca SHA-256: fdd0e1e078c6ca95d437920f12e5b8546d78f59b4ebbd76dcad47d2d83d25877
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a link farm or distribution network. No scripts were extracted, but the primary attack pattern appears to be directing users to external resources.

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://thebakerybox99.com/uploads/1/3/1/0/131070442/131070442.html#base64+pdf+viewer
    • http://nweqf.com/uploads/1/3/0/7/130776255/nusinanotuzo.pdf
    • http://studiodentisticosg.com/uploads/1/3/0/5/130543020/8fc40bae47f.pdf
    • http://triciazoellerauthor.com/uploads/1/3/0/6/130621643/megisafamomaso.pdf
    • http://www.lavie.lynn-gustafson.com/uploads/1/3/0/7/130775294/3f6d1404a2fe4.pdf
    • http://post.directory/uploads/1/3/0/4/130483993/8631c.pdf
    • http://shopnauticaldecor.com/uploads/1/3/0/6/130621095/mimamorije_zebibebujonog.pdf
    • http://jumpingtastebuds.co.nz/uploads/1/3/0/9/130969283/puxodunatubite.pdf
    • http://positivepushkc.com/uploads/1/3/0/6/130605017/2134089.pdf
    • http://vipcarenannies.com/uploads/1/3/0/2/130288447/1666642.pdf
    • http://formasspa.com/uploads/1/3/0/6/130621775/ruwufuberimifukowat.pdf
    • http://flashspizzablast.com/uploads/1/3/0/5/130588703/740ac6b2ab54d.pdf
    • http://rockkicker.com/uploads/1/3/0/4/130476548/76da5.pdf
    • http://amanaexpress.net/uploads/1/3/0/5/130539840/3788007.pdf
    • http://npep.com/uploads/1/3/0/6/130620380/7573361.pdf
    • http://cyaracing.com/uploads/1/3/0/4/130435909/4ddb831db0607a.pdf
    • http://aetherman.org/uploads/1/3/0/9/130969509/vamogaxax.pdf
    • http://noscopegaming.net/uploads/1/3/0/7/130738894/c6333a823.pdf
    • http://whenapp.com/uploads/1/3/0/7/130775370/pibogelovo_naborujizapo.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_off000054b7.bin
0a161007a14343eb276e06ec1985b2f34d300b931fb7eb09e3512c5a082aa247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B7 6756 bytes

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