Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b12778d7d77e76…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 22:34:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bdb364403c10b6bc12ae7008a735db15 SHA-1: a862d6e4cc592d5d9b5960752a1998f231be8896 SHA-256: 41b12778d7d77e76d4c29bbf00ca75796f2e176d88c345b8fb3d258f1972a04e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The primary redirector URL is https://netcdn.xyz/app/479516143/free-minecraft-skins-pc-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/479516143/free-minecraft-skins-pc-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-but_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/mc-hacks_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.freenom.comHeyIn 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_off00004a48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A48 25204 bytes
SHA-256: 4d80f335a92bdb3459914fbbb95986c2284892d5b01b9573f9d1a15c7ad4f951
font_01_sfnt_off000083e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D83 17892 bytes
SHA-256: 38d2ac9589c51081060ff5b719ef2985d9213db1bca3ba0b1a36204662c24b5d

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