Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a391313c9f40f11…

MALICIOUS

PDF

35.6 KB Created: 2021-07-07 04:45:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 96cbaa1f331fc0c6ae8174dde9a5bb0b SHA-1: 0955e0fb28c3a92c1ab6bcbb174da873c0e20980 SHA-256: 8a391313c9f40f11941488f1ff0b063291cba4145558790d8d4fd7082e7fc830
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to the URL http://netcdn.tw/app/406889139/coin-master-free-spins-only-game-hack. This URL is also listed as a known malicious redirector. The document body contains similar lures for free Robux and Coin Master spins, reinforcing the social engineering aspect. While no scripts were explicitly extracted, the nature of the redirector suggests it likely leads to a further malicious download or exploit.

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-only-game-hack In PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/je-cheat-dans-roblox-4-000-000-millions-de-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-download-games-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/get-free-absol-egg-brick-bronse-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/roblox-free-roubx_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn8madiun.sch.id/__statics/gudangsoal/files/robux-com-free-robux_GM431946152.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_off0000334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x334B 23536 bytes
SHA-256: a7abaa792ac47633dc5a321c337d635052b1a76fd47fb88b78186bac5637eb90
font_01_sfnt_off00006822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 18428 bytes
SHA-256: f57f8b21c02b66169ef231feeb17cfb16603379852549c8906bae8109884bca6

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