Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a6658bcc75e08b…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 22:27:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 52ba17ba29b12b7c8b4e9a245b6fd915 SHA-1: 927b925e87145374798b959c472bdae2d805984d SHA-256: f8a6658bcc75e08b0cbad8fc6d2f8643981cc5eb8ae38f52573fed12cec17eee
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 0.9865

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.online/app/406889139/coin-master-links-2021-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pubg-uc-redeem-code-midasbuy_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-hacked-version_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_004_off00004f3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3A 25524 bytes
SHA-256: f7750d82cdc2ba2988b4f9f3bb226a9f487ff51d691d9337d596b08c4d80d62d
font_01_sfnt_off000087ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87ED 18116 bytes
SHA-256: 6c2a50199d9b46215a875dc9668b69110360059bd5b64fd0f73058dd3f4c0f4e

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