Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a28cddad418d182…

MALICIOUS

PDF

49.0 KB Created: 2020-04-04 15:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0aaccaf6e4e60146cab547eb392e9e4a SHA-1: 2da80526325ab4e8f992f63bcd6e08c3ad73ea1d SHA-256: 4a28cddad418d182b87a4d0292f715c9b29decde1be786d3d39d9478f9397ffa
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which follow a similar numeric or slug-based pattern, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various domains, indicating a distributed infrastructure for hosting potentially malicious content or redirecting users.

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://pettreemusic.com/uploads/1/3/0/3/130379162/130379162.html#que+es+el+fluido+fisica
    • http://bbpci.org/uploads/1/3/1/4/131414134/nulawutezax.pdf
    • http://gbcbuilders.net/uploads/1/3/0/4/130477346/8625475.pdf
    • http://myhrbasics.com/uploads/1/3/0/7/130776874/79ab134.pdf
    • http://enlightensenses.com/uploads/1/3/0/8/130874030/tuvewu.pdf
    • http://englishgoldenbreeders.us/uploads/1/3/0/4/130435803/ca562293d01f55e.pdf
    • http://sv-og-erp.de/uploads/1/3/0/7/130739211/nutifedifo-labojejaji.pdf
    • http://gbeausartdesign.com/uploads/1/3/0/4/130488382/bajog.pdf
    • http://everthingship.com/uploads/1/3/0/7/130776149/78518c3.pdf
    • http://phoebehychan.net/uploads/1/3/0/7/130739751/92650.pdf
    • http://laughingdragon.com/uploads/1/3/1/0/131071312/wegajowofari-nemep-vutekakupowenej-niputufapisi.pdf
    • http://nicorosch.com/uploads/1/3/0/8/130874615/zodiziwak_tamokamojub_guniruvoguf.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_off00007634.bin
465215ead6d076d0a8532ed2bb69a3ae3ba39bfa72f1f8100184488f95cb0fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 9224 bytes
font_01_sfnt_off00009682.bin
9f5082701ede3b34412025578f3613d16372f7e661c8785cd8d7b7f4cdd3c0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9682 2800 bytes
font_02_sfnt_off0000a063.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA063 16036 bytes

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