Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c938fca7788cbe5…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 05:09:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4cde74675105616ecb34651c17bc3661 SHA-1: 59400fad17d8f1b6ef8c5db93e0a416f7980a427 SHA-256: 7c938fca7788cbe582a6d830529e74e1bd72563009c59e1d4d314a489dd5d900
260 Risk Score

Malware Insights

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

The PDF document contains numerous links, including a primary link to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for "game hacks" and "generators", which is a common tactic to trick users into downloading malware or visiting malicious sites. The presence of a fake CAPTCHA further supports the malicious intent to deceive the user into executing further actions. No scripts were extracted, but the overall structure and linked content point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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.xyz/app/406889139/como-descargar-coin-master-hackeado-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-games-that-actually-work-2021_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_003_off000049f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F7 24228 bytes
SHA-256: 61329fb41e85544a19eb332100add42e87937c52b87583fa33ef09f06ae31961
font_01_sfnt_off0000809f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809F 18608 bytes
SHA-256: 3a154f5a4a32679d9f3e6ef86049faeafa20c75b70f76f1241b456008a739927

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