Malicious PDF — malware analysis report

Static analysis result for SHA-256 4890a6ed15b2fabb…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 09:04:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fef8e2734585646ac708939bd384c902 SHA-1: 413f870ed82af3a8d857b4d3337bc01f2ed57a9f SHA-256: 4890a6ed15b2fabb84f8be1a3f8c9ae189770f2165e80f3ba4ae63d7553d4f19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free Robux and game hacks, which is a common social engineering tactic. It contains a critical heuristic firing for a malicious redirector link pointing to 'http://netcdn.tw/app/431946152/free-robux-codes-generator-no-verification-game-hack'. The document body confirms this lure and includes the same redirector URL. The presence of embedded URLs and the nature of the lure suggest an attempt to direct users to potentially malicious websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-codes-generator-no-verification-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-do-i-change-my-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-roblox-games2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-booga-booga-fly-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-dinero-en-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/carte-de-roblox-hack-gratuit_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-agust_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robuxfr_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-using-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-block-piece-roblox-autofarm_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-lvl-7-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-coin-master-spins-and-coins-for-daily_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_off0000308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308E 22904 bytes
SHA-256: 4d1debabede6841d5e608c42af4e29d5691ad1d9f90aa88cb4b2e8cae43b2d12
font_01_sfnt_off000063ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 19248 bytes
SHA-256: ae2c0d8972e31d5fd2442df1a166e7aa138b9e721d28ea80a1459ad28ac3a5a0

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