Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c8585ebb51d286…

MALICIOUS

PDF

35.8 KB Created: 2021-07-05 00:20:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8bc5151f26458c1bdbd8b446f4092938 SHA-1: 4a31893f5081bb680aa2ca4134dd180ce2fe472b SHA-256: f3c8585ebb51d286c6c4c8bf9e7df6bdc563546a8cd5500a73e3ae29f1bd7987
220 Risk Score

Malware Insights

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

This PDF document is designed as a lure, using the promise of game hacks and free currency to entice users to click on external links. The document contains a large number of links, many of which point to a domain associated with a link farm, likely for SEO manipulation or to distribute further malicious content. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-game-hack, which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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-free-spins-and-coins-game-hack In PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/cheat-sur-tout-les-jeux-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/hack-roblox-system48_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-cheats-codes-and-hacks_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-on-ipad-pro_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/synapse-free-download-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-how-to-change-your-name-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/cheat-engine-30-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/is-there-any-way-to-gte-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-aesthetic-outfits-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/hacks-for-ninja-legends-simulator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-voo-hack-com_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/comment-avoir-robux-infini-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-cool-lit-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-daily-spins_GM406889139.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_off00003443.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3443 23428 bytes
SHA-256: 7a8cf4b4fb8b31c291e5ccb74810503ac6e8f24bfff8335818c803ddb60c54ef
font_01_sfnt_off0000693a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 18348 bytes
SHA-256: 3aa320ccb9cb7c087074e4ef079b33192d8e05703f275142029ef104db56ac85

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