Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdf984518c66a87…

MALICIOUS

PDF

38.9 KB Created: 2020-03-13 07:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1db7d5677b9863fbdfeb39476145b4ed SHA-1: 4ad31e0de866c2fbb791b9395e82d1f451aa8646 SHA-256: 3fdf984518c66a87808780ea9d9f28544db1b478828623a57ecb1fad2237bef3
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic firing and the numerous external URLs embedded within the document. The primary purpose appears to be redirecting users to a large number of other PDF documents hosted on various domains, likely for SEO poisoning or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious.

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://dces9.salon225.com/uploads/1/3/0/7/130739809/130739809.html#apache+nifi+registry+user+guide
    • http://bmcl.us/uploads/1/3/0/3/130379377/9116312.pdf
    • http://www.efecto-digital.com/uploads/1/3/0/7/130775668/dedewezavit.pdf
    • http://mta-sts.mail.pilgrimadventures.com/uploads/1/3/0/7/130738946/9b344585e4.pdf
    • http://belindawabelo.com/uploads/1/3/0/6/130620202/jeruxa.pdf
    • http://www.restorationsundayschool.com/uploads/1/3/0/5/130539935/juwakemezoja.pdf
    • http://shelleycorr.com/uploads/1/3/0/5/130544687/viduw-xadavetokeluget-wisometunele-dopomek.pdf
    • http://treinasoft.net/uploads/1/3/0/7/130776083/8178e65.pdf
    • http://www.misssurfingchef.com/uploads/1/3/0/4/130435947/6709f913a.pdf
    • http://incamamas.com/uploads/1/3/0/7/130740209/f9eba8bbaa564be.pdf
    • http://www.seed2bowlfarm.com/uploads/1/3/0/7/130739727/leboxenenozemulatosi.pdf
    • http://naiadenorthamerica.com/uploads/1/3/0/5/130589123/nurakafidiwuvoduvu.pdf
    • http://www.industrialcommercialdomestic.com/uploads/1/3/1/1/131164291/diletab.pdf
    • http://www.nwtfishing.ca/uploads/1/3/0/8/130813730/kavipetujusizu.pdf
    • http://thebosna.com/uploads/1/3/0/7/130775346/9904668.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_off00006dcc.bin
3ef5cd0cf7b119a2323d4108a63775002ec6e18fdcd2b1df2126c4ef2461e647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 8008 bytes

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