Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf53998a579fbee9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 21:29:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7508f4f835968b0618ddcd907aef92a SHA-1: f0fed495c1d33da86f0768d3a2e4249b1be16868 SHA-256: cf53998a579fbee932e07872f231bcce2a4b341418423ffd23759c6a31896a6f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/inappropriate-roblox-games-game-hack. This lure is designed to trick users into believing they can get game hacks or generators, likely leading to further malicious content or downloads. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/inappropriate-roblox-games-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-not-for-sale-roblox-templates_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-robux-real-easy_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/robux-download_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/funny-tshirts-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/dll-injector-roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-cheat-table-for-cheat-engine_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/20219-walk-speed-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-robux-hack-script_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-fix-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/cheat-codes-for-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-com-free-play_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
font_00_sfnt_off00003101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3101 21996 bytes
SHA-256: abef6fe6d2f0b57c5d1b82d37f6794f763cdf57c587a937057c76b0b5193e394
font_01_sfnt_off000061eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EB 19144 bytes
SHA-256: 79a6a5a9ae6257ea638799cb32a861e3301f0777c40791eec12f5a449b6bff8a

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