Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de51ee0b40cd73a…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 16:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2e261a9e691efe80bef7ade2d8c47cea SHA-1: 1dbe2ad6013825c454bc7aad1af0cb4e55bdf78e SHA-256: 1de51ee0b40cd73aab3b27a3b76285813f508f8186ccec2667cbcdd6093a9440
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a 'game hack' lure. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the lures suggest an attempt to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/479516143/minecraft-cheats-pc-2021-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/xray-hack_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/promo-codes-for-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_004_off00005503.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5503 28352 bytes
SHA-256: 3258b2faa56cb194701df704429a8e1b3c5a20a7dac9a81471ec234ad8da263d
font_01_sfnt_off000092db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92DB 18292 bytes
SHA-256: 2d037195ba652ec1c948f4cf72bc757aedb522eec45588ee568a5b79e45c6912

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