Malicious PDF — malware analysis report

Static analysis result for SHA-256 232fbd78971c1233…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 17:09:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f4b2e6d0c9d09857dff1b71e3339063 SHA-1: 10ddd594bd1ce532a6ca98b3d669ff41d00a301d SHA-256: 232fbd78971c123382ecdee8ff36cf3bab20060764866df38e38291d33182e13
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of free game hacks and generators to entice users. It contains numerous external links, including a primary link to a 'free generator / game hack' and a mass link farm pointing to other PDF documents, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicates maliciousness, and the structure suggests it's part of a larger campaign to drive traffic to link farms or potentially deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.xyz/app/479516143/minecraft-xbox-360-free-game-hack PDF link annotation
    • http://sbm-nn.ru/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004833.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4833 24904 bytes
SHA-256: cde7becea641a69d3a20c01f276411ab3eabb91ca641655eef274c3820891f0c
font_01_sfnt_off000080be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 18820 bytes
SHA-256: 548eb6d6d76b0782fa129353e40cf244a6945086c4e3cc69bdc72bd715347561

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