Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ea5252433e5cb6…

MALICIOUS

PDF

33.7 KB Created: 2021-07-03 13:45:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 182fbddef073861936516a1ebd28227d SHA-1: b975ff0c2fe9ad8c2626484ea044cb014c38637f SHA-256: 82ea5252433e5cb60efcc64130bcbac369c9b591941f0dfff773d3d3bdc327d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'generators' for popular games. The document body and embedded URLs suggest a lure to download or access cheats, which ultimately leads to malicious PDF files. The ML classifier also strongly indicated maliciousness.

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/robuxmatchcon-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coins-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/script-hack-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-game-pack-with-google-play-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_002_off00002be0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BE0 22652 bytes
SHA-256: ac19e7d2f0889a8ed25f29a829b39eab1734b54e63340637d3e659ef82dcdeb8
font_01_sfnt_off00005ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA1 19084 bytes
SHA-256: 22fb853357d700a883506443e03244379ebe89dfe763389f41fb0df375e68649

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