Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb82abe137d79cd…

MALICIOUS

PDF

34.4 KB Created: 2021-07-02 04:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4523772709059a074088c2738856e896 SHA-1: 5adcef708b9fee81ed0220f8626608247a5b153b SHA-256: 4bb82abe137d79cd7cd2f4ca4a019e5124e5175718d50395be9e3a02cce27dee
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 'free generator / game hack' lures. The document body and extracted URLs indicate a social engineering attempt to trick users into visiting these sites, likely for further malware delivery or credential harvesting. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/robux-fun-roblox-online-hack-game-hack In PDF document text
    • https://razredna-nastava.net/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-titanic-infinite-points-script-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-client_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-free-games-to-play-online_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-hack-rc7-download_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-robux-pc-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-robux-hack-robux-generator_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-roblox-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-coin-master-cards_GM406889139.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
font_00_sfnt_off00003056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3056 22208 bytes
SHA-256: 55478cb44f1f23746555e65a9496dc0596deb792a12d5bdb7c79bf49bc63ae81
font_01_sfnt_off00006191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6191 19080 bytes
SHA-256: 13ddd0086e3bd9bf79ce5c07d1703916d54d7fef2719841e94e58a1ae3e06e57

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