Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92a472d183119cd…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 07:48:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5784507cfa40d0a535912062ad899389 SHA-1: 3cceee04a6dff58acde13e6cf75b73f12795c439 SHA-256: c92a472d183119cd7746400c94bf376a65432dcd3c3222ac0113efb8350c7863
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and hacks for popular games to trick users into clicking malicious links. The document contains numerous URLs pointing to redirectors and potentially malicious PDF files hosted on `netcdn.tw` and `thamelinn.com`. The ML classifier also strongly indicated maliciousness.

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-no-generator-game-hack In PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/youtube-roblox-free-robux-without-downloads-legit-2021-urban420-network_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-hack-client-deutsch_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-online-roblox-studio_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-the-quarry-cheats_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-link-no-verification-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_off00002dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDA 22116 bytes
SHA-256: 21b15d913412262e8ad5a23e25b2d6ced0af413fe2337c4e3b30cf89029a2f37
font_01_sfnt_off00005f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 18820 bytes
SHA-256: 261ea0d489a423ac242e977cf9c2ebb558fc055835ac2ff71b731d45313ea59b

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