Malicious PDF — malware analysis report

Static analysis result for SHA-256 401d827e1d0bdc4c…

MALICIOUS

PDF

52.7 KB Created: 2020-04-06 14:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3359b09b8ed7176b541fa5b58276bc4 SHA-1: ce13a29f336a1407746f4ee75caee26dcfda62cb SHA-256: 401d827e1d0bdc4c19f8b70233f83a792106050a8c51923be1e8e75c23397b53
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a mass of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to numerous PDF files hosted on various domains. The ML classifier also strongly indicated maliciousness. This suggests a link farm or SEO poisoning attack, where the goal is to drive traffic to potentially malicious content or manipulate search engine results. No scripts were extracted from this sample.

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://skincarebygac.com/uploads/1/3/0/4/130483959/130483959.html#conclusion+de+un+proyecto+de+distribucion+de+planta
    • http://sculptedbrowsandbeauty.com/uploads/1/3/0/2/130287898/e249ab835ae.pdf
    • http://keystone-usa.net/uploads/1/3/0/2/130289524/9890648.pdf
    • http://chaosandcuteness.com/uploads/1/3/1/0/131070591/fogigug.pdf
    • http://primeinstallations.net/uploads/1/3/0/4/130489423/kosunebididope-kibufomoreje.pdf
    • http://customcastsystems.com/uploads/1/3/0/6/130604378/zitarufugebabud.pdf
    • http://simpleebowtique.com/uploads/1/3/0/3/130379610/3883987.pdf
    • http://bourboncreekdesign.com/uploads/1/3/0/4/130492441/kixiwarukakar.pdf
    • http://agilitysalesllc.com/uploads/1/3/0/7/130776873/9196793.pdf
    • http://koreaworldtexas.com/uploads/1/3/0/6/130604525/nomilakab-sonifot.pdf
    • http://justinlandry.net/uploads/1/3/1/3/131379946/4e4ce9d3a9.pdf
    • http://yunspm.com/uploads/1/3/0/6/130639836/pulexilokop.pdf
    • http://webdisk.communityloavesjax.com/uploads/1/3/0/8/130813965/pixawisiberufex.pdf
    • http://curbsidechronicles.net/uploads/1/3/0/3/130379194/4ee5dc5eec.pdf
    • http://keeora.com/uploads/1/3/1/0/131071033/loximanerujagevofafu.pdf
    • http://illuminatious.com/uploads/1/3/0/6/130621749/6516437.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_off0000a140.bin
170f5d8bf12594258798ff4a3351fa6f8db7d3a722d3bfbd81619f01b4fe4010		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA140 9676 bytes

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