Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e7e89dc9b185c6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 16:11:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 550eb0654aac197a85b48128fdcb3089 SHA-1: efca2199ca76526c631209672f8b7fcdf2c4a6fb SHA-256: e4e7e89dc9b185c6dc98cdc9cb7f6e3f5e69aa2abb1ab1d938df05ac4ccea513
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in game hacks. The embedded URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-on-android-game-hack, is associated with known malicious redirector infrastructure. The document body and metadata confirm the lure's theme and the PDF's generation method.

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/431946152/how-to-get-free-robux-on-android-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-cheat-money-into-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/4-op-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/games-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hacker-shirt-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-oof-sound-copyright-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-texture-packs-java_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
font_00_sfnt_off000031c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C8 22864 bytes
SHA-256: b05283d7818496505c56cf0618ead225c866e4f14c9413e4ce35288565f2e5bd
font_01_sfnt_off000064d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D4 19280 bytes
SHA-256: b9c958d983b97f7968ab46997b490559e339ab7431e824395394db593a3c865b

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