Malicious PDF — malware analysis report

Static analysis result for SHA-256 85db041e8cb550b2…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 11:57:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aafee92d37fcea649ccf427668b3d127 SHA-1: c12a6391215a9a551c98b4de824e653671cb7e24 SHA-256: 85db041e8cb550b255c8583e7ae769aa2399f18119757f7019582e0d83da8b04
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and game hacks to trick users into clicking malicious links. The document contains multiple embedded URLs, including one pointing to a known malicious redirector infrastructure and another to a raw IP address, both of which are designed to lead users to further malicious content. The ML classifier strongly indicated maliciousness, supporting the observed lure and redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/free-account-roblox-with-robux-game-hack In PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-get-free-spins-in-shinobi-life-roblox-125_GM431946152.pdfPDF link annotation
    • http://111.68.26.74/widyapustaka/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-3-letter-roblox-names_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/cheat-roblox-ios_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/games-like-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/avatar-animation-free-roblox_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/how-to-get-free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/robux-hack-for-2021_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/abstract-free-hack-roblox-download-safe_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-one-piece-unleashed-hack_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/what-game-on-roblox-gives-you-robux-without-hacking_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/71-free-robux_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/heroes-online-roblox-free_GM431946152.pdfIn PDF document text
    • http://111.68.26.74/widyapustaka/repository/roblox-how-to-get-free-shirts_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_002_off00003032.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3032 22924 bytes
SHA-256: d71e70fcee11c7a07674ad8393e36c87bdbd95921a505c97a151d162bc545067
font_01_sfnt_off0000639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 19376 bytes
SHA-256: aca93b4e3f604d5c7fb305f64f27e26b52b7bc87275afcbcda3d4758617aefe4

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