Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb89e87961a2134…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 07:43:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3e02d6f412d11d996e1a00ff8f138dc7 SHA-1: f66e23302ad697988067d449adc2975013eb677a SHA-256: ddb89e87961a213460e48d19423b34ca55ba7c53def4110d1a3e4cae77d7ba99
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to malicious redirectors and SEO-linked PDFs, masquerading as game hacks and generators. The primary redirector URL is https://netcdn.tw/app/431946152/cool-cheat-engine-hacks-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow intended to lead users to potentially harmful content or further malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/cool-cheat-engine-hacks-roblox-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-play-minecraft-online-for-free_GM479516143.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/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-prison-life-cheats_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-xbox-one-free_GM479516143.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_004_off000050a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A5 25304 bytes
SHA-256: 97db34a4f65d151fbee5d4af467d4811d6264383aef6371a16578042712f9a82
font_01_sfnt_off00008aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEC 18860 bytes
SHA-256: 8591cea784bb42342933265b52eee2af97efa27e9fc50ae4563e5001fb65bf2f

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