Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b40aed5f85d48…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 13:56:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 82bec2ff64b6f2daa0e8eee8dff7c6b6 SHA-1: d13fda02c9aba3bc2f2c374e12b382122af76e1b SHA-256: bb6b40aed5f85d48feb565704bf1fbbcceddcab155a4401c81cd7daa0cc32b57
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links designed to lure users to potentially malicious websites, disguised as game hacks and generators. One primary URL, http://netcdn.tw/app/406889139/legit-free-spins-coin-master-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a focus on SEO link farming and redirecting users to external content, likely to distribute further malware or engage in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/legit-free-spins-coin-master-game-hack In PDF document text
    • http://digilib-ppsunisma.ac.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/robux-hack-generator-club_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/whats-a-code-for-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-generator-just-enter-password_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/hacking-scripts-to-hack-roblox-gamemodes_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/promo-codes-to-get-free-stuff-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/infinite-jump-roblox-download-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-free-robux-world_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/hats-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-mining-simulator-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-fly-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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
font_00_sfnt_off00003217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3217 22780 bytes
SHA-256: c839311f7118ad3395d9695c2d471049efec0d7d44df54c69bd57acfab5e403f
font_01_sfnt_off0000652f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652F 18176 bytes
SHA-256: 306c3b6095d1991059b25385d3e7cac4e1613d3ee958be56c36e50ec503f6c94

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