Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2830da51d29c6b6…

MALICIOUS

PDF

74.6 KB Created: 2020-07-19 03:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f2c8e45e4a41c7ea4aa266c53764ca SHA-1: 2e4fba1b77b8ed8f92f51624f860f8a902bca0b1 SHA-256: b2830da51d29c6b6fe2563c53404a1686cfb1cbda258bf7d09d1527826f490c9
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, including one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the file is designed to redirect users to harmful content. The presence of numerous links suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Dropper.Agent-9528636-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9528636-0
  • 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 https://ttraff.com/wb?keyword=kustom%20signals%20pro%20laser%20iii%20manual
    • http://files.boshamretreats.co.uk/uploads/1/3/2/6/132681156/wisudafiliposurejuxe.pdf
    • http://files.bgphotographic.co.uk/uploads/1/3/1/3/131380754/fecaac9d54.pdf
    • http://files.hairts.com/uploads/1/3/0/8/130813827/sopaligol-vumedi.pdf
    • http://files.udcns.org/uploads/1/3/2/3/132303118/voxijonekusawo.pdf
    • http://files.theevenbetterlife.com/uploads/1/3/1/4/131408537/92ab96cd0c5ce28.pdf
    • http://files.theevenbetterlife.com/uploads/1/3/1/4/131408537/92ab96cd0c5ce2
    • https://gusugiji.files.wordpress.com/2020/06/6421500243.pdf
    • https://varomujuvine.files.wordpress.com/2020/07/nonawutirakikorisiwe.pdf
    • https://gatemiw90480454.files.wordpress.com/2020/07/68323118642.pdf
    • https://somotug.files.wordpress.com/2020/06/zesasivufosagapesufilawo.pdf
    • https://lubizup.files.wordpress.com/2020/06/65369412645.pdf
    • https://zigonafi.files.wordpress.com/2020/06/wagowejupukebipumot.pdf
    • https://pigarudumo.files.wordpress.com/2020/07/bibenepu.pdf
    • https://peboxemodu.files.wordpress.com/2020/07/38161881659.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/sefog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4384/files/4301004149.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/20970445853.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/mofakitokunenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/wareburujuzonodibim.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/69301250559.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fc.bin
ab4203bc80fe566c7948a8847a7c47a62086917acb6c9dc8aa9b58c8388c31bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 4992 bytes
font_01_sfnt_off0000f7db.bin
a36639b6d7b637885068cb899a0139a67c269687b96dd0b6bba38bff2e912ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 11080 bytes

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