Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f26226f704161d…

MALICIOUS

PDF

43.3 KB Created: 2021-05-19 04:40:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a370fece48dca9c98434faea701d0ae2 SHA-1: ab2e607c74d486f7455eb0d406d2d410e2e513d5 SHA-256: 50f26226f704161d3cb93b2c161dc6146db64f53b9ca8dec97cee9e31b17a41e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, including a primary redirector URL associated with malicious activity. The document body and heuristics indicate a lure for game-related cheats and downloads, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/479516143/minecraft-pe-apk-free-download-game-hack In PDF document text
    • http://mydevice.com.au/images/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://mydevice.com.au/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://mydevice.com.au/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://mydevice.com.au/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://mydevice.com.au/images/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://mydevice.com.au/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://mydevice.com.au/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://mydevice.com.au/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://mydevice.com.au/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://mydevice.com.au/images/roblox-army-free-robux_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_003_off00004c16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C16 25168 bytes
SHA-256: fdd2c75e39b975cbb5a8a78a2c637a0e76df618aed52d7ac6a262a6c46c61999
font_01_sfnt_off00008593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8593 18788 bytes
SHA-256: 56ecf13b7fdae58d5e4afb69efa7bdb7b8d9a7a0932eb3c661bed49813117ab2

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