Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c780b51ef620562…

MALICIOUS

PDF

35.6 KB Created: 2020-03-30 18:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbbb06fc545b68242e6d5d630aebe394 SHA-1: ef3966f3bef25d774a622bc982f89c581518cd72 SHA-256: 1c780b51ef620562a76153ea2c04ad459d24004de314ef40970d87ebffcaf793
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to host malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the primary attack vector appears to be directing users to potentially compromised external sites.

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://surykyom.com/uploads/1/3/0/6/130639162/130639162.html#metro+last+light+good+ending+guitar+tab
    • http://tjsk9academy.com/uploads/1/3/0/7/130740556/2033823.pdf
    • http://shortpumpfarm.com/uploads/1/3/0/5/130588405/5a3e59.pdf
    • http://supremespeech.com/uploads/1/3/0/4/130483558/bonutojawisizolotutu.pdf
    • http://jenaechristinaesthetics.com/uploads/1/3/1/0/131070011/5933253.pdf
    • http://rogerweltman.com/uploads/1/3/0/5/130547515/1348769.pdf
    • http://viva6666.com/uploads/1/3/0/3/130313783/d019b850e.pdf
    • http://rohrrack.com/uploads/1/3/0/6/130605253/fe495.pdf
    • http://lazylstudio.com/uploads/1/3/0/4/130483390/0876dacad426.pdf
    • http://imaginaryadventures.me/uploads/1/3/0/6/130621330/7132534.pdf
    • http://lifeinbloomaromatics.com/uploads/1/3/0/3/130379912/de3364ff.pdf
    • http://furbabyinhomepetcare.com/uploads/1/3/1/0/131071038/lokisesapoditu-kaxodokogepo.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_off000064db.bin
cef975393692bdf86c57ff5d0dcfde31866a850805807f7be9847775d0d40eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DB 7344 bytes

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