Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18aa6f9aa376e80…

MALICIOUS

PDF

36.5 KB Created: 2020-05-03 09:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 386b6c4ff1840cf18f4d10e449fafe72 SHA-1: 84167ca0e9ed886f99b4860a44b0a99143e4ac41 SHA-256: b18aa6f9aa376e80c3d1ab1c19599537cace121543fd87c7fbb9f776b88520cd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file exhibits characteristics of a link farm, with a high number of external links pointing to various domains. The ML classifier strongly indicated maliciousness. The document body contains a URL that appears to be the primary lure, directing users to a network of SEO-optimized PDF files. The presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to potentially malicious content.

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://unique-security-solutions.com/uploads/1/3/1/4/131408899/131408899.html#free+green+screen+explosion
    • http://grayfurnacemanmakesbeermakesbeercom.com/uploads/1/3/0/2/130289603/973397.pdf
    • http://dloutfy.com/uploads/1/3/0/6/130604349/panevozopizuz.pdf
    • http://feedtanzania.com/uploads/1/3/0/9/130969954/42197ac505.pdf
    • http://danprattdrums.com/uploads/1/3/0/7/130775286/tarerawokeja.pdf
    • http://dwp-mont.com/uploads/1/3/1/1/131164236/totobadugupib_josiduporovav.pdf
    • http://laceymoore.com/uploads/1/3/0/8/130813841/da616.pdf
    • http://oh-m-y.org/uploads/1/3/0/7/130739978/93e8595c10baf1.pdf
    • http://bddrives.info/uploads/1/3/0/4/130490053/nivururukawawuvejab.pdf
    • http://4lyfe.net/uploads/1/3/1/4/131407901/laruxizajowugak.pdf
    • http://themsu.org/uploads/1/3/0/3/130323214/fibagutigera.pdf
    • http://betterbabybox.com/uploads/1/3/1/4/131452867/xoboxuzotafik.pdf
    • http://wheelhousenyc.org/uploads/1/3/1/4/131409574/0bbee88847.pdf
    • http://britelligence.com/uploads/1/3/1/6/131606539/lulud_tutoxo_fosujog.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_off0000629c.bin
58295598d2351c38b07ecb300b53b1c3be0eaa6dbd181a04a47bd68dff6daac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 10556 bytes

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