Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec12ad3e42f4446…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 19:58:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7f982ff18756b75966b1cd0fad83fa2a SHA-1: bf96e5eb8559c0e9641816f5c13a7fe9aa917a18 SHA-256: cec12ad3e42f44463418b8e4deade280991eebcd6fddd36f02a49bbed573b153
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in game hacks and generators. The primary URL, http://netcdn.tw/app/431946152/how-to-get-free-skins-in-roblox-game-hack, is flagged as malicious. The document body reinforces this by displaying the same lure text and URL, suggesting an attempt to trick users into visiting the malicious site.

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.tw/app/431946152/how-to-get-free-skins-in-roblox-game-hack In PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-naruto-headband-roblox_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/pastebin-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-roblox-shop_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-coins-for-coin-master_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_off000030a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A6 22252 bytes
SHA-256: 9810557bbd680bb1aebdb40316d50b7b201f9295680cf7e376ecc3ab95aae5be
font_01_sfnt_off000061d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 19208 bytes
SHA-256: a93ce6332c799b848304eb8328869ffeaf86c3800306e20ed9f8815158fcadcd

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