Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d77efbfad47b2e…

MALICIOUS

PDF

42.9 KB Created: 2021-05-12 19:01:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5e3b875fdc0898eb315b6913c09d2b0f SHA-1: c8b77ae96388498faf28b21518575a0b25e1f5f6 SHA-256: a9d77efbfad47b2e7395b237c0b8b336d1be4ac6b143677c5b44fd005015863e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as generators for popular games. The heuristic PDF_GAME_HACK_REDIRECT_LURE specifically identifies this pattern of luring users with game-related promises. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/431946152/free-ways-to-get-robux-game-hack In PDF document text
    • http://cruzdelsur.ru/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://cruzdelsur.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/mc-update_GM479516143.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/earn-robux_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
font_00_sfnt_off00004814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4814 25736 bytes
SHA-256: 2be79dc38f5d06d7fc663f6558b4332c87ba1c634848e29f77efe68137d4a534
font_01_sfnt_off00008405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8405 18724 bytes
SHA-256: 4748f019d46a9554f00c7c8cf9bb59ec204dfb95bc520e2d25b5a7c8ef81b270

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