Malicious PDF — malware analysis report

Static analysis result for SHA-256 8569620fd9734190…

MALICIOUS

PDF

33.6 KB Created: 2020-04-05 13:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbccbbda8d7d29c2bd1574b13fbe6c2a SHA-1: 51530ed156d851b0c8d6a4caf92cc75a5f7e1153 SHA-256: 8569620fd97341900457262cd25b98b80e36196bedcb7a322b11e70a1228f777
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous URLs pointing to various domains suggests a link farm or redirection scheme designed to obscure the ultimate destination.

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://thebusinesstip.com/uploads/1/3/1/4/131406592/131406592.html#somewhere+in+time+piano+youtube
    • http://solidsiteservices.com/uploads/1/3/0/2/130274267/8c4fa80785.pdf
    • http://kochlogisticsretail.com/uploads/1/3/0/9/130969796/7688453.pdf
    • http://ljjdesigns.com/uploads/1/3/1/4/131406569/4dc6d55dd.pdf
    • http://geekchiccreations.ca/uploads/1/3/0/6/130604940/sapododuzelebon-turadamagakiwu-xibugove-xovomalov.pdf
    • http://pumpkinandblush.com/uploads/1/3/0/4/130435569/fuzodoxoxil-fefiguxil-berikeso-xupari.pdf
    • http://shamakophotography.com/uploads/1/3/0/4/130478244/a84f1f860f9fe9.pdf
    • http://glengourdie.net/uploads/1/3/0/6/130639593/dijezugojuwokagusuxo.pdf
    • http://bellevuetn.net/uploads/1/3/0/6/130621657/viganeluv.pdf
    • http://simplystage2sell.org/uploads/1/3/1/4/131409305/zazuwup.pdf
    • http://michaeltaylorwrites.com/uploads/1/3/0/7/130738825/5755074.pdf
    • http://haddensearthmoving.com/uploads/1/3/0/6/130621206/2385090.pdf
    • http://nworparenting.com/uploads/1/3/1/4/131452745/winurapuji.pdf
    • http://chipsyhc.com/uploads/1/3/0/2/130287881/nokuwogag.pdf
    • http://teamwrightbrothers.com/uploads/1/3/0/9/130969293/dadotudax.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_off00005f76.bin
e484c557cd5529e11fe8da786f12af70c0c7bba2f044095f1d820f5e154f9392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F76 6852 bytes

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