Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1e061438a2f06e…

MALICIOUS

PDF

31.2 KB Created: 2020-04-12 06:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cfe802a3a13dc6c04c60b343fe28708d SHA-1: de7fb7a4b770a3f7b1b268520127bff078b79e50 SHA-256: 4b1e061438a2f06e1336f6175be0104f454286fd2cd2fc5ce0795595f5ce4dcb
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm behavior, suggesting the primary purpose is to redirect users to potentially malicious content or for SEO manipulation.

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://jmotta.com/uploads/1/3/0/7/130738769/130738769.html#vtech+cs6429-4+dect+6.0+manual
    • http://my-benefit.com/uploads/1/3/0/7/130776645/fc172a4357d8560.pdf
    • http://transformwithamy.net/uploads/1/3/1/4/131438268/7796522.pdf
    • http://anutrend.net/uploads/1/3/0/2/130288498/wozas-fudotiteva.pdf
    • http://angelescleaning2016.com/uploads/1/3/0/8/130874076/5692896.pdf
    • http://d6studios.com/uploads/1/3/1/4/131437595/40390.pdf
    • http://meshellsgifts.com/uploads/1/3/0/4/130476215/8263660.pdf
    • http://rehn.de/uploads/1/3/1/0/131070309/763228.pdf
    • http://edwardsautomotivemillingandi.com/uploads/1/3/0/8/130874220/1e9a77c.pdf
    • http://casadovovorecantodovovo.net/uploads/1/3/0/5/130551374/c3493b7.pdf
    • http://haznar.com/uploads/1/3/0/7/130739002/7872362b0cd46e.pdf
    • http://twgafc.net/uploads/1/3/0/7/130775865/nurubikufan-kadutejexefa-nupat-salugazodovu.pdf
    • http://tragedyacademy.com/uploads/1/3/0/6/130605406/tepanajuzupavenulij.pdf
    • http://thefuntasticfoodjourney.com/uploads/1/3/0/8/130814066/9238349.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_off00005387.bin
f5f6ad78ce7a338127d6cb08fa4963728cf9479ac9857ee1ec3babda6740eeef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5387 7364 bytes

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