Malicious PDF — malware analysis report

Static analysis result for SHA-256 031f1a7cb352ca68…

MALICIOUS

PDF

42.8 KB Created: 2020-04-19 04:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bcf7f623fff5041675cffe5c3f0f8ed7 SHA-1: 7f5e304cdbcb6873d07f7f140d75ae0b72ef7a96 SHA-256: 031f1a7cb352ca68471a93e0035d87d9ec0cea1b926f471cb682a7f0104852c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to PDF files with numeric slugs, indicating a potential SEO link farm. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to distribute malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://iteacheducationservices.com/uploads/1/3/0/6/130639963/130639963.html#writing+task+2+2019+with+answers
    • http://chicagolatexproducts.com/uploads/1/3/1/4/131453087/9721934.pdf
    • http://foodamonia.com/uploads/1/3/0/4/130476085/6522047.pdf
    • http://deeluxedesigner.com/uploads/1/3/1/3/131383854/5983201.pdf
    • http://ifaservices.eu/uploads/1/3/1/4/131407547/c366b4199a7ac.pdf
    • http://houseof7brothers.com/uploads/1/3/0/4/130477455/kijofaritu.pdf
    • http://onedayofbliss.org/uploads/1/3/0/6/130604871/4383555.pdf
    • http://northvanmusicacademy.ca/uploads/1/3/0/5/130539990/5022986.pdf
    • http://jadeduo.com/uploads/1/3/0/4/130436078/xafifatigipemu_diwopoken.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_off00007f17.bin
0bc8250d2f7e3de70f8a1264650fd672edd48fd8a32c755b1900ae1a19cd69b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F17 8464 bytes

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