Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a1ee1cea9e91a8…

MALICIOUS

PDF

36.2 KB Created: 2020-04-06 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11467860eb4b0ff0674a4a8a4b46e1bc SHA-1: 93e1009dcba32219520012e232a9b06bb84f3521 SHA-256: f4a1ee1cea9e91a88264a967b4bf306d46ce4480ddce256c5132c2ff66203ed3
94 Risk Score

Malware Insights

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

This PDF was flagged by an ML classifier as malicious. It contains a large number of external links, many pointing to similarly structured URLs on different domains, indicating a link farm or SEO spam tactic. The document body is heavily obfuscated and contains embedded URLs, suggesting it is designed to redirect users to potentially malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://simplyserinati.net/uploads/1/3/0/9/130969985/130969985.html#ansi+z136.1+laser+safety+standard
    • http://andrianaediting.ca/uploads/1/3/0/7/130776276/ad051752f.pdf
    • http://mbsuccesscoaching.com/uploads/1/3/1/3/131383416/5501368.pdf
    • http://acnibo.org/uploads/1/3/0/5/130546519/bupezuzutejad_vipirujekad_gufoze_solozam.pdf
    • http://caddylakecamp.com/uploads/1/3/0/3/130323485/5725000.pdf
    • http://joyadams.org/uploads/1/3/0/7/130776728/lezet-wupasejulo-gaman-tidegapu.pdf
    • http://cryptocoinwatchdog.com/uploads/1/3/0/6/130604758/6323760.pdf
    • http://mail.redd-i.com/uploads/1/3/0/4/130478882/f8695ccbf58f8.pdf
    • http://tratamientointegral.net/uploads/1/3/0/3/130379625/5e08f92d372.pdf
    • http://kingmunky.com/uploads/1/3/0/5/130551002/jivugopapa-dasajap-zidirukotukivu-medaw.pdf
    • http://neurodesignlab.com/uploads/1/3/0/6/130605244/nadatozeso-kuxuk-rewep.pdf
    • http://cnppilotshop.com/uploads/1/3/0/5/130588649/refemi-gidule.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_off0000665c.bin
b3ec52c6c1829d60cf8055a4d161d62a6b768e91c4e0d10ae58f6a7945484a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 7632 bytes

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