Malicious PDF — malware analysis report

Static analysis result for SHA-256 938f8ecd4ac873cb…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 14:22:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 34f4567642b09ff73b6ee3ef64e36a2a SHA-1: b717c74782d8568405c63d5537710ba8910ae04e SHA-256: 938f8ecd4ac873cbea5c52ade0d8e73edddd4d2457c96c29308e6519f5e27162
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for 'free generator / game hack'. The document body also contains the same URL, reinforcing the phishing attempt. While no scripts were extracted, the presence of a malicious redirector and the lure suggest a phishing campaign aimed at tricking users into visiting a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/835599320/free-tiktok-likes-youtube-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-make-shirts-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-face-in-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-mad-paintball-2-hacks_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-2021-april_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-hacks-and-cheats-for-mac-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-gang_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/jailbreak-free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/horrnoclip-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-gaming-roblox-recording_GM431946152.pdfIn PDF document text
    • http://www.tiktok.com/fypIn 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_off00003134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3134 21632 bytes
SHA-256: 44af63d13e1ca0dd09a8418be5a9c5546f5556547b258bf00ff180cba3162656
font_01_sfnt_off000060a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A0 18432 bytes
SHA-256: 040f60a8f3fc72d7110aab4923dedbadcfef14b18acd9ea3d0cc1e04ba2a2d98

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