Malicious PDF — malware analysis report

Static analysis result for SHA-256 a513bc87eabf228d…

MALICIOUS

PDF

39.5 KB Created: 2020-04-05 14:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7d590f79b5c7cafbc54682c3792c960 SHA-1: 3922b44d7b03ac16294ba00d824e5e2c0356c894 SHA-256: a513bc87eabf228d25b1e81ce242a503f14084c301696ca57f8fcca493ccee38
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and hosted on unrelated domains, indicating a link farm or SEO poisoning tactic. The document body, though obfuscated, contains references to 'Dungeons and dragons 5e starter set character sheet' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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://gemcogic.org/uploads/1/3/0/2/130287839/130287839.html#dungeons+and+dragons+5e+starter+set+character+sheet
    • http://ambrancedesigns.com/uploads/1/3/0/2/130272370/sibusalagis.pdf
    • http://colyarjewelry.com/uploads/1/3/1/0/131070137/99b2b9654591.pdf
    • http://sadiebarr.com/uploads/1/3/1/3/131398108/2826601.pdf
    • http://uniksphynx.com/uploads/1/3/0/3/130379239/7634934.pdf
    • http://kpobuildingsolutions.com/uploads/1/3/0/2/130289220/694a13427e1b17.pdf
    • http://myceavco.com/uploads/1/3/0/9/130969026/watozesozoreki_tajelowajobov.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_off00007130.bin
26c29161bfb434d610d1b55e084ead923b915b5d5bf72aaaf9d69d1c74e23860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 8436 bytes

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