Malicious PDF — malware analysis report

Static analysis result for SHA-256 d666b4e721d0f251…

MALICIOUS

PDF

36.8 KB Created: 2020-03-15 04:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4e9eacf55c162b2cf621d09379f2f93 SHA-1: eadbab0e165d9340bd0cb32db85882df82fb90a0 SHA-256: d666b4e721d0f251da421c1b5c8ed4f4fbb7cff2ac0e96ccd958d39e753a81f4
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'Bixolon srp 350ii driver free' download. It hosts a large farm of SEO-optimized links to other PDF files, indicating a link-farming or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent, likely to redirect users to further malicious content or phishing sites.

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://adsl-63-204-18-8.benefitplans.org/uploads/1/3/0/3/130323211/130323211.html#bixolon+srp+350ii+driver+free
    • http://drannskitchen.com/uploads/1/3/0/6/130604599/7410782.pdf
    • http://hostmaster.kieran-madden.com/uploads/1/3/0/3/130323375/juwififegi.pdf
    • http://priscaspiggies.com/uploads/1/3/0/6/130621293/7896724.pdf
    • http://blueoxorganics.com/uploads/1/3/0/6/130621530/mijikejafovol_maxozelapexi_tizixeni_wemerafifimako.pdf
    • http://www.cecerivas.com/uploads/1/3/0/4/130435619/rogomaxunejip_rikaxikiwun_vunuvan.pdf
    • http://jacquelineshiffman.com/uploads/1/3/0/4/130476083/d9c799be0aa.pdf
    • http://allstatepavingandmasonry.com/uploads/1/3/0/6/130639634/kanar.pdf
    • http://netwerkpijnrevalidatie.com/uploads/1/3/0/5/130551651/6733905.pdf
    • http://deadguycottoncandy.com/uploads/1/3/0/5/130590698/5302964.pdf
    • http://mutooroopastoralcompany.com/uploads/1/3/0/7/130740206/1346304.pdf
    • http://www.royalglossbrat.com/uploads/1/3/0/4/130489386/jaxawojana.pdf
    • http://psychotherapyportland.net/uploads/1/3/0/3/130379589/c16b2ecb3063f50.pdf
    • http://suprimos.club/uploads/1/3/0/7/130740073/2240743.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_off00006731.bin
29cd7c5e854990fff6dbd4073772e7bfd631eb7181b36f5864e5c8a698a9776f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 7948 bytes

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