Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a49c8ffb2f0f3a…

MALICIOUS

PDF

29.4 KB Created: 2020-06-06 11:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84f0940fa2035f7491710dce9ed9802 SHA-1: b161aa892aaabc4bb002e4f6a53b006eeee5dc3e SHA-256: 37a49c8ffb2f0f3a66b808adb735af0d53ae613994cd33d49f77acca5090c5b5
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or directing users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically identifies a large number of external links, many with numeric slugs, suggesting a link farm. The document body, though partially corrupted, includes a title related to a 'Playroom vr dlc trophy guide' and the authoring application 'wkhtmltopdf', indicating a potential lure. The ML classifier also strongly flagged this PDF as malicious.

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://jbladi.trevelle.com/uploads/1/3/0/7/130775393/130775393.html#playroom+vr+dlc+trophy+guide
    • http://juniperblend.com/uploads/1/3/0/4/130489423/nepimevul.pdf
    • http://blairfasan.com/uploads/1/3/0/4/130475909/jejofaxupubow_fodezum_vaxenijabur_kukulosuxu.pdf
    • http://handykiwis.com/uploads/1/3/1/3/131378919/a4423b04d811f14.pdf
    • http://jbladi.trevelle.com/uploads/1/3/0/7/130775393/terms.html
    • http://jbladi.trevelle.com/uploads/1/3/0/7/130775393/dmca.html
    • http://jbladi.trevelle.com/uploads/1/3/0/7/130775393/policy.html
    • https://rilivot.files.wordpress.com/2020/06/46774680702.pdf
    • https://pigeliw919772726.files.wordpress.com/2020/06/pewekasijegezanova.pdf
    • https://jidiluda.files.wordpress.com/2020/06/lumutejezamuzokanom.pdf
    • https://juzifak.files.wordpress.com/2020/06/jupaxetofiriwumafazakix.pdf
    • https://wibuvevi.files.wordpress.com/2020/06/zelopagivaza.pdf
    • https://lavivapuxe.files.wordpress.com/2020/06/24932752207.pdf
    • https://xixeganoso.files.wordpress.com/2020/06/jawusawebuses.pdf
    • https://wubatelevad.files.wordpress.com/2020/06/gutujupinuju.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_off000049cb.bin
3309cbe730b5f766057e8b20f9ab73d92a6de7de7a088d475e0f9db219f50d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49CB 9496 bytes

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