Malicious PDF — malware analysis report

Static analysis result for SHA-256 f244f7726b9d8f3a…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 08:38:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 439729614880a2c3cb5cff7cfe18d654 SHA-1: 1cc4f811cca9f9035d3dcbd8048295149e9a08b6 SHA-256: f244f7726b9d8f3ab305e515c06ac75df87e4bb3b8b286b4c87d6468aa014ff5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and game hack lures, indicating an attempt to direct users to potentially harmful websites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment. The document's content, though partially obfuscated, suggests a social engineering tactic to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/hack-para-coin-master-sin-verification-game-hack In PDF document text
    • http://digilib.iailm.ac.id//repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/tiktok-free-100-fans_GM835599320.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/minecraft-free-exe_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
stream_004_off00004fcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCB 26240 bytes
SHA-256: 6c84504325a110b90e26e7ef4789e8e553745a1857156893ad4d401249e9bb10
font_01_sfnt_off00008c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9B 18004 bytes
SHA-256: 5a160e1e3a55dba1252c7000e4eeb391006454b083247bbd903365d672dc9cd4

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