Malicious PDF — malware analysis report

Static analysis result for SHA-256 54889f37f670b4de…

MALICIOUS

PDF

44.0 KB Created: 2021-06-11 05:38:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: afd24d0dfba768729c77ec83f42eea21 SHA-1: 0aaa802e4fd1e473569ca5027ec3eb4b39d8497e SHA-256: 54889f37f670b4de9c3e0c892571760988a1c26c4d02997daefae10f7ee4f14b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generators" and "game hacks" for popular games like Roblox. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the lure strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-play-now-roblox-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/free-robuxrblx-file_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pubg-uc-voucher-code_GM1330123889.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-penguin-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-no-password-or-download_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-for-kids-no-vertification_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-can-i-get-free-coinsn-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
stream_004_off00004fc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC2 25084 bytes
SHA-256: 505509c93dc28dc19e652807e13dd868e75afe6d79c1cd95687c503aceb255b5
font_01_sfnt_off00008834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8834 18672 bytes
SHA-256: f0863478ec6be72ada7d2812af87635c803dbca272cf90861c97160ff5efa4f4

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