Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d6e64c1e1604b8…

MALICIOUS

PDF

47.7 KB Created: 2020-07-08 16:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1371d1a2748e09476733434c8ddc1509 SHA-1: e4b1ac95b73f7796368f521bc21fa112d4e84956 SHA-256: a2d6e64c1e1604b82feaa4252459a47a46d7351796bacbeba78067bcc7623f78
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are part of a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though obfuscated, contains text related to 'types of projective test pdf' and a URL that appears to be the initial lure. The primary attack pattern involves redirecting the user to malicious sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.cc/wb?keyword=types%20of%20projective%20test%20pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdf
    • http://files.paiboon.biz/uploads/1/3/1/4/131406762/1208977.pdf
    • http://files.maxperformancefitness.com/uploads/1/3/1/0/131070527/komokimil.pdf
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdf
    • http://files.seameocelll.org/uploads/1/3/1/3/131398066/caaf936b6e.pdf
    • https://jinogajun.files.wordpress.com/2020/06/denum.pdf
    • https://pimudan.files.wordpress.com/2020/07/tusemimoxizofojala.pdf
    • https://rojevaliri.files.wordpress.com/2020/06/davuvepalotebeb.pdf
    • https://suvumeg.files.wordpress.com/2020/06/86705134965.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.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_off00008013.bin
cfbd2cf6295a9fe120420a35c9b7085d96df43268863999cc20423b0f066a748
pdf-font-stream PDF embedded font (sfnt) at offset 0x8013 4776 bytes
font_01_sfnt_off00009080.bin
735c991d15beb321a3481a1759a4e1af2606e65af5dd660625b72208ed72655e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9080 9828 bytes