Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7a30a5f8365b09…

MALICIOUS

PDF

43.4 KB Created: 2021-05-14 13:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c12137d6661d6ad393e3bc92d8c716ba SHA-1: 737dee7f6dc73333d763ebeae8abcf9aba48da10 SHA-256: 3b7a30a5f8365b09668c2f9cbe26b5b126ec9f99dc1e0472400b7531445e6103
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as game hacks and generators. The heuristic firings indicate a lure for game-related content, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/minecraft-complete-handbook-game-hack In PDF document text
    • http://www.visiblefilm.com/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://www.visiblefilm.com/images/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.visiblefilm.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://discord.ggIn 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_off00004b28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B28 26124 bytes
SHA-256: f919bf101a3d53378d192e2e549cd3d6bb2a98ce87b8641d420476578b6b303c
font_01_sfnt_off00008637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 18724 bytes
SHA-256: 92d200d6f1a6fdb520fe7b7a4fe4beb50248f688d0ff503977d63a4c72546565

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