Malicious PDF — malware analysis report

Static analysis result for SHA-256 577f6f9615c6c0a2…

MALICIOUS

PDF

42.0 KB Created: 2020-04-30 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f16310191f8b44dda3a5e31aaa823ce9 SHA-1: 1c6c55699b9bf26a79c42e7f14c7b5fae6e93d19 SHA-256: 577f6f9615c6c0a264a7858e3730954c05ad21b25b40399a619a1da04f7f1691
94 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 similarly structured URLs on unrelated domains. The document body, though heavily obfuscated, contains text suggesting it is a 'strategy guide' and includes the authoring application 'wkhtmltopdf'. This indicates a likely attempt to disguise malicious links as legitimate content, potentially for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://referral360network.com/uploads/1/3/1/8/131856205/131856205.html#command+and+conquer+rivals+strategy+guide
    • http://huckleberryyoga.com/uploads/1/3/0/5/130539944/2e3b3c36ca6.pdf
    • http://lalaartists.com/uploads/1/3/1/3/131398064/5930b47002d02.pdf
    • http://whitflorbehavioralhealth.org/uploads/1/3/0/7/130775628/e81b15.pdf
    • http://marianasanchotene.com/uploads/1/3/0/7/130775792/korusa.pdf
    • http://yourpowertrip.com/uploads/1/3/0/6/130639506/xizimatobawobijovaz.pdf
    • http://vacationmagicbyemily.com/uploads/1/3/0/6/130604544/nivorezi-mowozabe.pdf
    • http://stubbornpositivity.com/uploads/1/3/0/7/130776141/dc4d6df7f18.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_off00007c03.bin
94818739c725fd58cbf9596435d263c6520263ad8fe842917d14576093dbda06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C03 7920 bytes

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