Malicious PDF — malware analysis report

Static analysis result for SHA-256 4161da50915535d1…

MALICIOUS

PDF

49.2 KB Created: 2020-06-14 20:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe168c23f975aab595d6ab76f1a1142 SHA-1: 81e55a1d756058134696a7dc3fb067965aa52909 SHA-256: 4161da50915535d13bf823b24eeb272749b37db3e0459c344aec7e90e1415aa1
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 point to domains that appear to be part of a link farm designed to artificially boost search engine rankings. The document body, though malformed, suggests a lure related to a 'study guide'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, but the primary attack vector appears to be directing users to malicious or deceptive external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://everetttreeservicepros.com/uploads/1/3/1/1/131164440/131164440.html#fundamentals+of+psychology+in+context+study+guide
    • http://janekirby.info/uploads/1/3/0/8/130814124/rasax.pdf
    • http://spiritualdirector.life/uploads/1/3/0/7/130739756/xifoxutimulapa.pdf
    • http://frogpigpug.com/uploads/1/3/0/6/130639842/nokoge.pdf
    • http://zellabarket.com/uploads/1/3/0/7/130738623/zevafuni-tubali-fularupe.pdf
    • http://stateofsoundstudios.com/uploads/1/3/0/4/130477864/3982036.pdf
    • http://scanproky.com/uploads/1/3/0/4/130483253/9618929.pdf
    • http://youthgrace.org/uploads/1/3/1/6/131636988/c063b.pdf
    • http://fastagentincome.info/uploads/1/3/1/3/131384489/9f905.pdf
    • http://rachelliu.me/uploads/1/3/0/4/130491253/dc71bb2760.pdf
    • http://admin.hwupenyuproject.org/uploads/1/3/0/6/130639784/paxapuselipegi.pdf
    • http://wolfecityhomecoming.com/uploads/1/3/0/3/130379049/vigira.pdf
    • https://faxonitu.files.wordpress.com/2020/06/40099122315.pdf
    • https://jizogal.files.wordpress.com/2020/06/sokosak.pdf
    • https://puwubovefije.files.wordpress.com/2020/06/64052744939.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_off00009410.bin
9950c195416852f1d67126df3015a27f9352611d433b0af7787418e65e6fb6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9410 11024 bytes

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