Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e864c6dc4da3b96…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 21:10:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d720ed76d34e11978c82bb9955444872 SHA-1: 6261e73715c004a97199dc337e8a6a67954f011f SHA-256: 8e864c6dc4da3b967262ff3ecf197092dad29baffebd7af78e4ad67f6b59d037
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and SEO link farms, all promoting game hacks and free in-game currency. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-facebook-game-hack, which is flagged as malicious. The document body, though heavily corrupted, contains references to game hacks and URLs, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/coin-master-facebook-game-hack In PDF document text
    • http://mklista.ru/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://mklista.ru/images/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://mklista.ru/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/roblox-pics_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/free-links-for-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
stream_003_off000047bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BD 24852 bytes
SHA-256: 9b5c88f234d6a68f1ee5557790152cb9df55316adb4c2f195ba5cd4465320e73
font_01_sfnt_off0000803b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803B 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00008a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A26 18040 bytes
SHA-256: 84f206db0752fc1b1c3d9ee3ef2c899a5b2ff620242448cfed824ad49df6ef2c

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