Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68adb8bd400b137…

MALICIOUS

PDF

48.1 KB Created: 2021-06-04 03:40:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9ef850c6f595f42ceb9cb335268e285f SHA-1: 0159d48c23e1dffc04f657589fd1991a21a47cd3 SHA-256: a68adb8bd400b137569eabdebb02496eea7ab96c25f6514bb0d8c576236a8d5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The document body text and heuristics confirm the lure and the use of redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/free-robux-no-human-verification-or-survey-or-download-2021-game-hack In PDF document text
    • http://oca.undil.tl/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-obbey-easy_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hacks-for-roblox-jailbreak_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_off00005309.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5309 29116 bytes
SHA-256: e71bc25422dd452891d78a81d68be54d33826075c10a8116f1c4a9f555775690
font_01_sfnt_off000093cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CF 20136 bytes
SHA-256: 66e5e50e12f5eb49621ab9bcd6ab85026409d616512a452c1eb3339dd9867554

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