Malicious PDF — malware analysis report

Static analysis result for SHA-256 55682bd805b51161…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 22:08:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b158c88a205cabd362d770d46a3a931 SHA-1: 9eab21d87bbaf10076fc15e5f4020078f6e2f2f3 SHA-256: 55682bd805b511619627e67c60b127722f49fa4a1769da783e05233b99f252ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Hacks' and 'free spins'. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-hacks-for-free-spins-game-hack. The document body and heuristics indicate a lure for game-related cheats, likely leading to further malware or phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/406889139/coin-master-hacks-for-free-spins-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/hacking-script-download-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-someones-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-star-wars-roleplay-space-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-insta-arrest-hack-jailbreak-pastebin_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/robux-prices_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-attacks-coin-master_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
stream_002_off0000307c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307C 22972 bytes
SHA-256: e04551a6915b86d33897c7642d29782cfc19b82eec405828c1c3e44e00c6a176
font_01_sfnt_off0000640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 18344 bytes
SHA-256: 947667c85d24b0d3a8de245f111eeade861a88a333665e7462fd4878b305e25b

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