Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b07d576447a5999…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 01:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8735505ed1ac0c39836cdb6a6c00f5ac SHA-1: a32d06f49b3748e41ec269416b6a68af0e8972c4 SHA-256: 8b07d576447a5999df2fc36e3023fa27bfcf39f4ac66fe54df32d348032851ac
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.tw/app/406889139/coin-master-game-hack-app-download-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/cheat-extension-google-pour-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-2021-easy-no-inspect_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/huge-free-robux-giveaway-free-robux-giveaway-livesteream_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-how-to-get-synapse-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-roblox-jailbreak-keycard_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-robux-hack-free-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-play-roblox-piano-hack_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_off000030a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A4 23228 bytes
SHA-256: 0015b4d187a2089234397cc5c5e6867c6beb396f13906aa5e8c69160f3a0231a
font_01_sfnt_off0000646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 19020 bytes
SHA-256: 007d5ff507efed9807f41996b54bef03e92e728f4b38cbd3f29bd7fe12ad6663

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