Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff579a7adfc0f353…

MALICIOUS

PDF

45.8 KB Created: 2021-06-04 00:30:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 24716ebc3e33408c42a4d6f4be202dbf SHA-1: 05352e810255635f8b9fd8d12dec7188361e1ca5 SHA-256: ff579a7adfc0f353a97553a8e2a3b32dffce0201a98497b9bf3ffea40d2e1293
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free Robux, identified as a common lure for malicious redirects. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/games-that-can-be-hacked-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-download_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_off000050d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D0 27436 bytes
SHA-256: 50a40dfcc292e2263894eebcd10297819d1e017f13d42b31e2e72447cb0339e9
font_01_sfnt_off00009070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9070 18304 bytes
SHA-256: dfa8437c72db791aace135511bda9208016fcfe346c17eaaea4b366062f3a020

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