Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b61fbc8690b544…

MALICIOUS

PDF

45.3 KB Created: 2021-05-13 02:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4571c8d17cb5fb5bdf0a156a9cafd5bf SHA-1: 1a8733ed0e62eba4228afba7ac7266ea189c8fb3 SHA-256: 16b61fbc8690b544404e33d80079d514b93ba7251338584a2c943dcc26fceff7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, under the guise of offering free in-game currency. The document body, though partially corrupted, contains text related to 'Free Robux' and a URL that aligns with the malicious link findings. The presence of embedded links and the lure suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/free-robux-websites-that-work-game-hack In PDF document text
    • http://www.dcgsrl.it/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/install-coin-master_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://www.dcgsrl.it/images/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://www.dcgsrl.it/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dcgsrl.it/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4791 25820 bytes
SHA-256: 02057a96b25f4bf2675b8adcfd775064a58a8bab7954dccde2a31a2ccd0bb3a8
font_01_sfnt_off00008255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 19000 bytes
SHA-256: 7385cf8e30761df55e83d9792ae8d47179260988159899b0069d718a962ca50a

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