Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cfd4032fc3ad5e…

MALICIOUS

PDF

36.2 KB Created: 2021-06-28 07:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 59cf1b17986063859b3f7361be407e75 SHA-1: 25b7f90633362a119a3dcf40c23514302bee2b4b SHA-256: d8cfd4032fc3ad5ed806d6de0f2a6eb5ee5028963b057059ebbbd8ebd9570910
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that offer 'free Robux' or 'game hacks', indicating a social engineering lure. One of the primary links, http://netcdn.co/app/431946152/free-robux-code-hack-game-hack, is flagged as a malicious redirector. The document's content and embedded links strongly suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.co/app/431946152/free-robux-code-hack-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-whatsapp-tik-tok-status-download_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-have-hacking-tool-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/comment-hack-sur-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-earn-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/elysian-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/pastebin-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spin-hack-coin-master-2021_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
font_00_sfnt_off00003a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A10 22128 bytes
SHA-256: f0eef854c29f616af04487975992da5039de6c8e58a42835aca41c9a1fed24fe
font_01_sfnt_off00006b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B33 19060 bytes
SHA-256: 42993eba662e275727e17ed30358da51f88a1333fdddd8765b3b360921900d91

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