Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9aee57f64b956e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 16:09:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d741ac5da949b4def69d38b2899c79ba SHA-1: 0f20287eafc4b7d22d7d18df1971145b457c30fe SHA-256: 8a9aee57f64b956ed01d78719fc338640425204e534ff2b9a6c5cadbb682758b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to known malicious infrastructure. The document body and embedded URLs reinforce this, advertising game hacks and generators. The ML classifier also flagged this PDF with high confidence, indicating malicious intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/coin-master-heaven-game-hack In PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-free-dominus-hat-not-model_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/infinite-money-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-how-to-make-a-promo-code-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-created-by-jess-the-gamer-girl_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hackear-roblox-gratis_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/project-alpha-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-do-you-hack-pn-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-admin-egg-roblox_GM431946152.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
stream_002_off000031a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A7 22740 bytes
SHA-256: 809c17e2b07b3beae2f5e4d65fa02805500530e51dc99806f068ab974b6a9561
font_01_sfnt_off000064ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AD 17948 bytes
SHA-256: 2b0b7ff6293efa0103c8c2231913429400a11b3f6a70388b902ae1f868ebf0a4

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