Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b3209cd56e3ca0…

MALICIOUS

PDF

42.2 KB Created: 2021-05-15 17:18:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0a24c7ed5f13ee7830ea387ff5c38eab SHA-1: 64af290554b7d72c031512ebb76b5a3a62d02456 SHA-256: 48b3209cd56e3ca0acb254e19063ed8aec39af0d007db94ad1ff226f76c8f92a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and free in-game items to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts other malicious PDFs. The document body contains obfuscated text and URLs, indicating an attempt to conceal its malicious nature. The presence of multiple embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-free-clothes-girl-game-hack In PDF document text
    • https://tena-g.hr/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-assassin_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-roblox-accounts-with-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_003_off000048b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B5 25512 bytes
SHA-256: e4af13cc92469b04a33b0d88669c4d05eb4ce0a7c5ff1da5bcf06fb68caab1b0
font_01_sfnt_off0000828a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828A 18340 bytes
SHA-256: 43b97e088e2ffab0722e8ce3b94223e5cd299235dccb62a3edb2f682d17634b7

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