Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcef3049221c919…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 14:24:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eb975b0299c556c62ea56dbc4da5842a SHA-1: 4ba20c00a70d892dd4aa5c7648a727841f759532 SHA-256: 7bcef3049221c91904a2a77398b1ce6e52907c81920e3cf50cb9de3045f8ae5b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-400-spin-link-today-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs suggest a lure for users seeking cheats or in-game currency, likely leading to further malicious sites or potentially unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-400-spin-link-today-game-hack In PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/infinite-robux-no-human-verification-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pubg-uc-mtc_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/ich-bin-am-hacken-roblox-name_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coinmaster-rewards_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_off00002f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4B 22448 bytes
SHA-256: e46944c2f8b0ab1bca50cb1f48283abb3b3482a0dbf8e75eadef4c02537c2374
font_01_sfnt_off00006166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 18768 bytes
SHA-256: aa629642056b5d4821f8bce2482cb82682829ae1b8861c3e0dfcfd955968f5c0

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