Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb0caab428acf1f…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 10:32:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 72524515638db607117d39825a4e41aa SHA-1: f925ce6acb55c2d905d56445a8518c208b06402f SHA-256: ddb0caab428acf1f528a425b1efc04605aef97b20458d8c32d719054a16f7370
220 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free currency to entice users to click on malicious links. It contains a primary malicious redirector and a large number of SEO-optimized PDF links, suggesting a campaign focused on traffic generation or distributing further malicious content. The ML classifier strongly indicated maliciousness, and the heuristics point to a redirection and link-farming attack pattern.

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-hack-tool-2021-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/when-will-vesteria-beta-be-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacking-poeple-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/3-ways-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/code-roblox-card-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-verification-download_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/wearedevs-roblox-exploits-and-hacks--cheats_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/como-obtener-robux-usando-cheat-engine-66_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-to-take-roblox-eye_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-hack-no-survey-no-download-no-password_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-step-by-step-password-pictures-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-link-2021_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
font_00_sfnt_off00003194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3194 22852 bytes
SHA-256: 01b612c7b0f8f200da2adffca5b728e3ece0b6241593b6e21bc7faab4a051566
font_01_sfnt_off000064ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 18480 bytes
SHA-256: 3dc977bc1210ceeedde7f87719dab6f525ca5e29bcd32cbe92ee8e1a0ab21cbd

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