Malicious PDF — malware analysis report

Static analysis result for SHA-256 1442ac20da7303ad…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 11:06:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c4eb5cc4c4ffd1060ea4f84ffee573c SHA-1: 0a526377b9a5a7506a8dc0a2587ee22ae51a5522 SHA-256: 1442ac20da7303ad829b64b381017a88240a4533454aa65bb98bf11d9b55c4ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, directing users to a URL associated with malicious infrastructure. The document body and embedded URLs reinforce this lure by mentioning game hacks and generators. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood 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-hack-apk-download-2021-game-hack In PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-roblox-gift-card-codes-2021-march_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-the-quarry-hack_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-roblox-vip-login_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-admin-on-roblox-mad-murderer-2_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/codes-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-ban-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/descargar-hack-para-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-noob-army-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/scriptexecutor-roblox-free_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/is-minecraft-education-edition-free_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_off00002ed0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ED0 23568 bytes
SHA-256: f635bee7b4617338d9902a4367797e69373586e707d92b3f998a3fdfd9af8d09
font_01_sfnt_off00006436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6436 19160 bytes
SHA-256: 74154339b294d6feca0152a4072c83326c1fc7d9ddb702fdec28eb90277bbd47

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