Malicious PDF — malware analysis report

Static analysis result for SHA-256 736b138a1611a515…

MALICIOUS

PDF

44.0 KB Created: 2020-04-10 07:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9791c167c9d4ca84def4504b4a5bc761 SHA-1: 8d1f768eaed31c8cc014a6ecae4ce6ff5f713cab SHA-256: 736b138a1611a515a8ec9a59862b6701142d34f8c588031e5d9771410224a8d5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are disguised as download options for popular software like GTA Vice City. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm designed to attract clicks. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the structure and content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jcitaipei.org/uploads/1/3/0/5/130590217/130590217.html#download+gta+vice+city+for+android+apk+data+apk+mirror
    • http://snuk.io/uploads/1/3/1/4/131452818/sugum.pdf
    • http://600perryroad.com/uploads/1/3/0/8/130813400/pasifip.pdf
    • http://starstuff.video/uploads/1/3/1/1/131164048/gafasedo_zukimo_xuburewu_dowaxaseno.pdf
    • http://suzyart1031.com/uploads/1/3/1/4/131438207/selixi.pdf
    • http://odisg.us/uploads/1/3/0/5/130543369/4391592.pdf
    • http://loxelybeauty360.org/uploads/1/3/0/5/130546096/jaxekupedulo.pdf
    • http://freshasadaisygroomers.com/uploads/1/3/1/3/131383746/b532e84892ee813.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006edc.bin
6aad4f3aa39c354eefbf2b1e6b3d46ce79609953f39ad3817a69c24b5bc6c92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDC 8008 bytes
font_01_sfnt_off00008df3.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF3 16036 bytes

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