Malicious PDF — malware analysis report

Static analysis result for SHA-256 a906a54f5e6ff036…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 04:21:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c0a4a38750cbddbd3a0750fd4449577b SHA-1: 1c92b05791eb51e72dc4df7704d656650124d834 SHA-256: a906a54f5e6ff036a52b833c229bfbedaf1a7ac5683860b11694bd7d2d3fd56c
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.tw/app/406889139/how-to-get-free-spins-on-coin-master-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-catalog-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-hack-by-stealing-information_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-unban-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-use-noclip-hacks-roblox-2021-november_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-robux-no-human-verification_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_002_off000031e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E0 23184 bytes
SHA-256: b4f96dc0bea0929b9e6a91d7d027eb100920d0f889e6799915fbc79398e9b07e
font_01_sfnt_off000065d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D9 18336 bytes
SHA-256: f6486e4c00d3cdc8b5d1192946ddbf803be47e84f44f52a8e54ea271a052a700

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