Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9dd06256ba9aed…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 14:24:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21f4ec78bf2a0cc8f84c894d9eeda1b6 SHA-1: 583f233aa9eff06cb2f56c9b5e734c462a2c165b SHA-256: dc9dd06256ba9aed5f1a68b9691ca3a00f76f918cd5535a7b2fefcb2ea46ef93
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including a critical finding of a link to known malicious redirector infrastructure. The document body explicitly mentions 'how-to-get-free-spins-on-coin-master-game-hack' and directs users to a URL that is flagged as malicious. This suggests the PDF is designed as a lure to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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/how-to-get-free-spins-on-coin-master-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-xbox-1-cheats_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-ticket-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/take-me-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-a-free-dominus-in-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/mcpe-hacks_GM479516143.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_off00002e19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E19 22432 bytes
SHA-256: ac4e66ae4dd3ffc26872f3da1b9aa6e4d06a90330100feb5062608fe13427233
font_01_sfnt_off00005feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEB 18336 bytes
SHA-256: f6486e4c00d3cdc8b5d1192946ddbf803be47e84f44f52a8e54ea271a052a700

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