Malicious PDF — malware analysis report

Static analysis result for SHA-256 f831fefd7aa75d57…

MALICIOUS

PDF

49.4 KB Created: 2021-06-08 23:59:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a6b9b4c3588062aba01da9b5c48d7efc SHA-1: 14837758ebd8b419bf7356ac9a75b4df979fef3a SHA-256: f831fefd7aa75d57caf300ce43f6211eee111df8cc8b6f44a1644afcdc331672
160 Risk Score

Malware Insights

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

The PDF contains a lure for a game hack generator, which redirects to known malicious infrastructure. The document body and embedded URLs indicate a phishing attempt to trick users into visiting a malicious site. No scripts were extracted from this sample, limiting further analysis of its execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-twisted-murderer-cheat-engine-2021-game-hack In PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pokemon-go-joystick-free-download_GM1094591345.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B6 26060 bytes
SHA-256: 523d7cd7ba1baae80a117bb54cc11d80cd2f4a0fecdd2802705633eb20b75a65
font_01_sfnt_off00008cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000099c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C5 19768 bytes
SHA-256: 69fc06fca48cb964037c250cb92883aa4c05660e7b00ccea765b646dbd62644a

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