Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa179e1f41f8d2bd…

MALICIOUS

PDF

52.5 KB Created: 2020-04-16 15:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a55fc48d881ee71e52127b14650745d SHA-1: 006155ff1b53893e9068bc55a053971eb2f69e3b SHA-256: aa179e1f41f8d2bd5372dfd7bfd696ba12eda0c4f919eb49639d99b043d1f296
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a collection of PDF files hosted on numerous subdomains, likely for SEO manipulation or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kenraye.net/uploads/1/3/0/6/130621003/130621003.html#accelerometer+sensor+android+use
    • http://mydigibong.com/uploads/1/3/0/8/130814248/9206ac5.pdf
    • http://heartworkbykatie.com/uploads/1/3/0/7/130738837/kejerexumimemifupaz.pdf
    • http://dzire2inspire.net/uploads/1/3/0/5/130543682/lapugirafiw.pdf
    • http://jonnoblogs.com/uploads/1/3/1/3/131398525/6001029.pdf
    • http://schneidercleaningservice.org/uploads/1/3/0/5/130588342/nodeguveno_nurawidene_milowago.pdf
    • http://megan-elizabeth-photo.com/uploads/1/3/0/6/130621871/2437685.pdf
    • http://classicphotoshoots.com/uploads/1/3/0/2/130289291/genawip.pdf
    • http://mhsbooster.bluewireweb.com/uploads/1/3/0/4/130476079/1dbb2a670338277.pdf
    • http://meatfreemondayfood.com/uploads/1/3/1/4/131410167/dogevapegi-ramog.pdf
    • http://capitalfencingmaintenance.com/uploads/1/3/0/2/130287284/zegozokuxovepu.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_off0000a237.bin
36d175ed9d80247f26ad297a6cbe86a3e196641318ac3d691f6415f4c810acec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA237 9456 bytes

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