Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebdfc5ca239b9a8…

MALICIOUS

PDF

45.3 KB Created: 2021-05-11 04:11:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2e7d5932032e9ea5c95c25ef87b10e7e SHA-1: 32b67ce52d2426ba6909586b1523ca53e8996379 SHA-256: 7ebdfc5ca239b9a84915d09320edc79c1d031635ed2d71f9555fbb16bd3d0811
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that lead to a known malicious redirector infrastructure, specifically promoting game cheats and free items. The document body, though partially corrupted, contains references to 'cheats for coin master' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/406889139/cheats-for-coin-master-game-hack In PDF document text
    • http://www.bripi.pl/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-link-today-new-2021_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
stream_003_off00004951.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4951 25000 bytes
SHA-256: a440d8bc7b1bb02b5eae09dc4e04d6fab4628387ed2d8e8c3d60e0a163fe96d8
font_01_sfnt_off000081c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C3 19040 bytes
SHA-256: 4d7152e1194ce60e686f7101da5adf169048d63eec74d023d25beaa6914146be
font_02_sfnt_off0000a608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA608 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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