Malicious PDF — malware analysis report

Static analysis result for SHA-256 961726a0a2b58dd2…

MALICIOUS

PDF

44.2 KB Created: 2021-06-09 02:50:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c56eab47c2701fb55b6f999a8be892e9 SHA-1: 818b3befbd509530deb0a84d517aa680228ec1cc SHA-256: 961726a0a2b58dd2adddd0b93728ffbc11628ed661a2a3b4bc686a556909cbc7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to known malicious redirectors, specifically advertising game hacks and exploits. The document body and heuristics indicate a lure for free game-related content, which is a common tactic for distributing malware or leading users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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-level-7-exploit-roblox-no-virus-game-hack In PDF document text
    • http://oca.undil.tl/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-password-cracker_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-pe_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-accessories-for-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-make-free-robux_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
stream_004_off00004e33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E33 25512 bytes
SHA-256: 46dc8e61c9d56347b6c80865843ca7db2150fbb1b07349946e3af541eec11e1a
font_01_sfnt_off00008865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 18792 bytes
SHA-256: 1c043632c2d653c5be528dee6ee49d95b1e2d0cbb164565fcecc26cc0280b961

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