Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dffba5b2d81dd9…

MALICIOUS

PDF

33.1 KB Created: 2020-05-29 08:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a2d67e45d8255ec8d152ac4686710e SHA-1: 95c2225fcd2f5f4e574ee3296712474ec80214b7 SHA-256: a2dffba5b2d81dd9d302421923fdf7f4173ba2ca333bec34690089e28d78d889
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, characteristic of a link farm designed to artificially inflate search engine rankings or distribute malicious content. The PDF_SEO_LINK_FARM heuristic specifically identified this behavior, pointing to multiple numeric-slugged PDF links hosted on various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to compounds and molecules, potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://7levelselling.stefanaarnio.com/uploads/1/3/0/5/130590051/130590051.html#compounds+and+molecules+worksheets
    • http://o-w-l-s.net/uploads/1/3/1/6/131606789/1431759.pdf
    • http://cassietrendz.com/uploads/1/3/0/7/130775337/pegine_kezuseloliwe.pdf
    • http://mail.alicepark.com/uploads/1/3/0/5/130588692/b38460658f6a8f.pdf
    • http://friendswoodflutist.com/uploads/1/3/1/3/131384679/8261007.pdf
    • http://positivelysisters.com/uploads/1/3/0/6/130620407/1275493.pdf
    • http://llerandisport.com/uploads/1/3/0/6/130604045/tokatuvi.pdf
    • http://acresofpeach.com/uploads/1/3/0/6/130605381/920204.pdf
    • http://mcalpinconsulting.org/uploads/1/3/0/5/130589199/najoxefuwixefepiwar.pdf
    • http://tarotgirlnextdoor.com/uploads/1/3/1/4/131413222/dupuwa_megujo_jagebazup_lokafus.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_off00005731.bin
c1d4cc11c2152780e6b987ccaa5da4a1d792f20fe22c8d12134dfad21f501c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5731 9976 bytes

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