Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a749221c1af0a6…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 03:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3f9edfb9cefb7d1066f464eb4f6b3436 SHA-1: b8db58e7babd7b38d84a3f4f6c6ac4345c4ee6c8 SHA-256: a6a749221c1af0a66224fdd75595fd363d8eacce02d0bdae2ffa2c7f6a925c7d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious. The document body and embedded URLs suggest a lure for game-related hacks, specifically 'Coin Master', aiming to trick users into visiting the malicious site. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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-free-spins-2021-hack-game-hack In PDF document text
    • https://library.stikesmi.ac.id/repository/pokemon-go-free-gift-codes_GM1094591345.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/without-human-verification-pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-hack-to-get-roblox-money-easy-way_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spin-ml_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_off00003080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3080 23084 bytes
SHA-256: fca2bc1de368805c119aafab3bc639d6367f35a50961319c426ae743b8334506
font_01_sfnt_off0000645d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645D 18748 bytes
SHA-256: 92aaead82d55c20f13300fdcc9721abaffa6ca8ca490d535bbad7112df5e0c31

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