Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af266634c4cd5a7…

MALICIOUS

PDF

53.5 KB Created: 2020-04-05 04:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee8327b467961fa45d5a505d9f327140 SHA-1: 9fb31f7a900e3e5a2b6dd9236a66596fd80e8b79 SHA-256: 3af266634c4cd5a7b7bec6f5c6ef3ca7777002a3b6e7bc6de696e16ac8234e67
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a campaign to drive traffic to these external resources, potentially for advertising fraud, phishing, or malware distribution.

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://hypoxiqenterprises.com/uploads/1/3/0/2/130274282/130274282.html#9.+el+sistema+antibloqueo+de+frenos+abs
    • http://phscapital.com/uploads/1/3/1/0/131070124/3417960.pdf
    • http://coolekleding.nl/uploads/1/3/0/3/130379583/lukevowijosapu.pdf
    • http://afteralltheseyearsbook.com/uploads/1/3/0/6/130620267/xamubiguzagisofe.pdf
    • http://livcentral.com/uploads/1/3/0/2/130288883/a333d0865.pdf
    • http://toriseabovepoverty.com/uploads/1/3/1/0/131069923/6716009.pdf
    • http://highlandsoppsllc.com/uploads/1/3/0/6/130604243/babok_kazilujakata.pdf
    • http://ourtraveledition.com/uploads/1/3/1/3/131383294/3695413.pdf
    • http://wecon.co/uploads/1/3/0/7/130740401/8920697.pdf
    • http://weaverpaving.com/uploads/1/3/0/6/130621527/d9f668081.pdf
    • http://honesthomebuyer.com/uploads/1/3/0/7/130775053/nekuxofupabevi.pdf
    • http://touchedbyprodigy.com/uploads/1/3/0/2/130289346/najeragigajevo.pdf
    • http://lenasboutiqueofsweets.org/uploads/1/3/0/5/130589083/6e4dc69aee4caf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084d9.bin
3f6afbd62f9a3852fd9a825f026bc5b3cef6cb22f129fc99c82b4a44f98353de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D9 9932 bytes
font_01_sfnt_off0000a831.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA831 2652 bytes
font_02_sfnt_off0000b198.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 16036 bytes

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