Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b327913dd1ce14d…

MALICIOUS

PDF

30.1 KB Created: 2020-06-13 07:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3618026596586090833d6a79ac643ad8 SHA-1: 317e7d76c9935fa268c71fe9adf57637f1df60d7 SHA-256: 8b327913dd1ce14dede184b69d1d241ff9172fb1939b7c2ed7c07d5054300872
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body also contains a URL that appears to be a lure for game-related content, which is likely a pretext to direct users to the link farm. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

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://tarasnaumenko.com/uploads/1/3/1/8/131872155/131872155.html#gta+san+andreas+ger%25C3%25A7ek+hayat
    • http://hostmaster.spanishamericanmission.com/uploads/1/3/0/3/130379821/parigemorivepuzowul.pdf
    • http://spacemeasuring.com/uploads/1/3/0/5/130538985/wawepatug.pdf
    • http://craigsoklahomapride.com/uploads/1/3/1/6/131636782/552766.pdf
    • http://mail.ben-stephenson.com/uploads/1/3/1/4/131406289/6339838.pdf
    • http://ksbassociates.com/uploads/1/3/1/4/131407665/1385485.pdf
    • http://anniesloss.com/uploads/1/3/1/4/131482823/a8495d2e5c4.pdf
    • http://vmbconsultant.net/uploads/1/3/1/4/131437812/3807867.pdf
    • http://marybrummel.com/uploads/1/3/0/3/130323765/4639431.pdf
    • http://admin.hwupenyuproject.org/uploads/1/3/0/6/130639784/paxapuselipegi.pdf
    • http://vcvids.com/uploads/1/3/0/2/130273610/fupamugorakine_bazekidut.pdf
    • https://fumepuwabipa.files.wordpress.com/2020/06/navokekupaxubumixojo.pdf
    • https://tesagimin.files.wordpress.com/2020/06/pirukowexepofita.pdf
    • https://vuvokanasaz.files.wordpress.com/2020/06/749162227.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_off000049a4.bin
842f1f56d18c1307c51e29716c9f05f5d088e8e58dd348c921f21d2d4e9b5433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49A4 10664 bytes

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