Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b78bc691a334cf…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 02:09:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a98121d3321e67b1d1ef01cd0b5f17af SHA-1: 6295703e53bfbf6f34f90666befd6f1af2592fc7 SHA-256: c6b78bc691a334cf8b62620ca303d6135209251edfd1cfc9b0821b986b92cec2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free spins. The primary lure appears to be related to 'Coin Master Free Spins'. The embedded URLs are designed to lead users to potentially harmful content or further malicious downloads. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-free-spins-link-today-instagram-game-hack In PDF document text
    • http://cofys.nl/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://cofys.nl/images/coin-master-daily_GM406889139.pdfIn PDF document text
    • http://cofys.nl/images/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://cofys.nl/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://cofys.nl/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://cofys.nl/images/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://cofys.nl/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://cofys.nl/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cofys.nl/images/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://cofys.nl/images/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://cofys.nl/images/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://cofys.nl/images/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://cofys.nl/images/oprewards-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_off000048c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C7 24856 bytes
SHA-256: 00e742c1683e080c103928033291639f1825f0f20feacd62a493415e3226905b
font_01_sfnt_off00008157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8157 18960 bytes
SHA-256: c3cae131f36bdfe9c813bd150295f39ca0ceeabf3546a2df254cc03f93d9c6e3

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