Malicious PDF — malware analysis report

Static analysis result for SHA-256 a901bcaa6aa34e03…

MALICIOUS

PDF

33.9 KB Created: 2021-06-27 16:15:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c79c286700b74a11932dcb5ee50b2cb3 SHA-1: d09484c518325a069ce2f205a180ff51daf2e733 SHA-256: a901bcaa6aa34e0355cd8f7fe59a7ea48660b0bb594521d756bab66d90d0e485
142 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. 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 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 http://netcdn.co/app/431946152/i-hacker-roblox-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-hack-booga-booga-download-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-counterblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/tiktok-free-blue-tick_GM835599320.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hack-robux-2021-do-inspect-element_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-into-a-account-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
font_00_sfnt_off00003185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3185 21456 bytes
SHA-256: 003f5de143648bd6ba8c8aeb2e4bd7b2978d5ec92d06ebf18efe2e1a55ae3a68
font_01_sfnt_off0000606a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606A 18656 bytes
SHA-256: 7b31a2e52b7991e97c77a15486a1c2c89d8bf35079b763e5ab4327fb1e8ad1b6

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