Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1594544789c881…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 06:09:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce24510e0c86c96c462c4c10ca5d6f08 SHA-1: e13e3661ce072c4f27bf8918fa67abaf7027a614 SHA-256: 0f1594544789c8810c9a577c7a8b642a287948a8514f3954dc5a86436f2810c8
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency and hacks to entice users. It contains numerous links to malicious redirectors and SEO link farms, which in turn host other malicious PDF files. The ML classifier strongly indicates malicious intent, and the presence of multiple critical heuristic firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-hack-online-cheat-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/l-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-how-to-get-free-gift-card_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-do-you-speed-hack-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/be-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/yt-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-cheat-codes-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-mm2_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-domino-crown-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pet-sim-online-hack-download-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-2021-june_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
stream_002_off0000312a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312A 22928 bytes
SHA-256: 86e69582dc223c0cec13d449b460bd6f5693a777fed517c63a02ee8612684630
font_01_sfnt_off0000648d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648D 18244 bytes
SHA-256: 4a6d454e3ee6c1dcb03a272ca36e6340e030a828ec80bd2668db4bff24f8dce7

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