Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1943ad6841273e1…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 00:21:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e1fd74a078c120b15f61e85599cb9aed SHA-1: 55a4acbb2dfb95cedaeee058f505200a1f42fc0e SHA-256: c1943ad6841273e15efcf449a9a1890d738087873d9a7ef17f1bae57297671e7
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, specifically linking to a URL associated with free Robux. The document also displays a fake CAPTCHA, a common social engineering tactic to coerce users into interacting with malicious content. The primary IOC is the redirector URL, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/431946152/www-roblox-com-robux-free-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-redeem-code-generator_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.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_off00004fe9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE9 27676 bytes
SHA-256: 17ac33633da100b59f5ddc3cac1521829a40f6075f37e4be85c188578765eb05
font_01_sfnt_off00008d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4E 18708 bytes
SHA-256: c91f27fd30ec200e2a0dbd5cc88ad35776bc2371b1b59549651737de5f7a4295

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