Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ac0cf138b0fadd…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 19:13:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 18540227b5b2a37acfc6fe7b44018c67 SHA-1: e44881d2febc8af3813b527b51034499d101e357 SHA-256: a9ac0cf138b0faddd28a2e5b7babef2d87363b1a4759f18feb8ca9951fc4c163
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game generators and hacks to entice users. It contains numerous links, including a primary link to a known malicious redirector at `https://netcdn.xyz/app/406889139/coin-master-free-spin-link-twitter-game-hack`. The document also hosts a large number of SEO-optimized PDF links, suggesting a link farm designed to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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-free-spin-link-twitter-game-hack In PDF document text
    • http://www.copoint.co.uk/images/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/free-coin_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/earn-free-robux-today_GM431946152.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_off00004875.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4875 25576 bytes
SHA-256: b82bface3307c16055695682b2b73b97d8a8f9d2f51bacbe32d995b3eb6ec1a7
font_01_sfnt_off0000846c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1D 18220 bytes
SHA-256: b594fc670d790d0d446ae286633f4f60e484476280493cebd05396ea33631896

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