Malicious PDF — malware analysis report

Static analysis result for SHA-256 235951fe19b25938…

MALICIOUS

PDF

28.6 KB Created: 2021-07-01 06:48:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 314e212f783278982617f9818c532a0d SHA-1: 8876b6fefe2a8fa4716a1c3dbcceb9fdeb63b14b SHA-256: 235951fe19b2593850ed33f58fc78b7d8a87c8524be28ec160a4ba93f2154d62
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains numerous links to external PDF files and a primary redirector URL, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple redirector links confirms its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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://netcdn.co/app/406889139/free-chest-coin-master-game-hack In PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/roblox-cheat-engine-murder-mystery_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/roblox-spongebob-shirt-free_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/book-wings-roblox-free_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/robux-pin-free-no-verification_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/easy-robux-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/mario-64-roblox-rom-hack_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/how-to-get-free-r-in-roblox_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/free-roblox-promo-codes-march-21-2021_GM431946152.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://man2kediri.net/__statics/gudangsoal/files/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003124.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3124 23192 bytes
SHA-256: 6da46e35f1661e721df4728a6b7199c3d91745fadd38b3a67877feec65225a5c

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