Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf55d357d30dbd5…

MALICIOUS

PDF

37.8 KB Created: 2020-03-25 13:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 200e81d745425624457928a664a7360a SHA-1: 16131baddb9ff23188b6f5c28c2a5934b3987143 SHA-256: aaf55d357d30dbd5678937f11085a65047de2311c782e039160667aa7ae0e5c5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which follow a pattern of numeric slugs and book-related terms, indicating a link farm or SEO spam strategy. The document body, though partially corrupted, contains text related to 'Livros geometria plana' and authoring tool information, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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://kylethewolff.com/uploads/1/3/0/8/130874378/130874378.html#livros+geometria+plana
    • http://loeblibrary.net/uploads/1/3/0/2/130288542/pezudaludorukiluvoze.pdf
    • http://nicolenedley.com/uploads/1/3/0/5/130589115/xotavatu-kegamawav-voluputuvo-pakebiku.pdf
    • http://www.martha-j-klein-artist.com/uploads/1/3/0/8/130814112/kabefiwutet.pdf
    • http://mail.cranberrylakesoap.com/uploads/1/3/0/4/130483122/13f9c0cd.pdf
    • http://bagwomenmen.com/uploads/1/3/0/6/130604054/vexomojanetafu_rofarifotavugo.pdf
    • http://mail.fewo-tecklenburg.de/uploads/1/3/0/9/130969465/92a5e5.pdf
    • http://ircventures.com/uploads/1/3/0/6/130640172/3242108.pdf
    • http://hippieretreat.com/uploads/1/3/0/3/130379228/78136c1219a3a7.pdf
    • http://mindbodymovementarts.com/uploads/1/3/0/2/130272856/gefik-femusato.pdf
    • http://redefinefn.com/uploads/1/3/0/6/130640105/tusoriziduned.pdf
    • http://jerremy.net/uploads/1/3/0/3/130312991/9daed5138797.pdf
    • http://banudivinity.com/uploads/1/3/0/7/130739156/9533542.pdf
    • http://raptor-dynamics.com/uploads/1/3/0/3/130313152/2102651.pdf
    • http://www.madebytsuchiya.com/uploads/1/3/0/2/130270897/07e52.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_off00006620.bin
d9f579f4582ed00a2f08a90f4b35d176522c330fc67db06f1e469878b55b5eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 10860 bytes

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