Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c191bc17efdb80…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 01:43:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 268b22d462919c9f040b0f9400d85fd3 SHA-1: 8a0d00741293327c76ffdc777c596aa3e431fa5a SHA-256: a4c191bc17efdb80352fcb9efdd04edab5962ca1530ecb49f48e3ee89cab94d9
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free game hacks' to redirect users to a network of link farms. The primary heuristic indicates a 'PDF SEO Link Farm' with numerous external PDF links, suggesting a monetization or distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to exploit user interest in free game-related content.

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/479516143/minecraft-education-edition-free-download-game-hack PDF link annotation
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/hacks-para-pixel-gun-roblox_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/roblox-script-hack-2x-luck-bubble-gum-simulator_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/roblox-egg-hunt-hack_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/roblox-has-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/how-to-get-roblox-on-xbox-one-for-free_GM431946152.pdfIn PDF document text
    • http://elearningalislah.mialishlahtiudangondang.com/__statics/gudangsoal/files/pubg-mobile-uc-2021_GM1330123889.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_off000034cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34CC 21928 bytes
SHA-256: 61683a85df28f9c5fe179e5192f329a5a271d0607906af4f73cbce483a54cc90
font_01_sfnt_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 18720 bytes
SHA-256: 1332db7e135f7bfb76e809d6c2e8d7d2fa6fdd2f7188446e7190a10c127a21d6

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