Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a292712da4c42f…

MALICIOUS

PDF

47.3 KB Created: 2021-06-08 11:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ae23fa753a4c0643a1d54c0e5052f27 SHA-1: 6b50fdc7e8d1f36f2da6d495e711308565a6df09 SHA-256: 99a292712da4c42f7b1cb6d08f6c29400ee5de11967aa88799338b04f4ab711b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on a "free generator / game hack" which redirects to malicious infrastructure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or scam attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/free-roblox-open-groups-game-hack In PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/roblox-demon_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/pokemon-go-free-yellow-egg_GM1094591345.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000518d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518D 25636 bytes
SHA-256: 881dce170effd31bbadfbd94b2d0104b348c7542b15606a62f1d522521204536
font_01_sfnt_off00008c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C12 2916 bytes
SHA-256: dfdf754e78c6401065e75f680828503eb1167ccc21c50ee87683498cbacda216
font_02_sfnt_off0000961e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x961E 18264 bytes
SHA-256: f1fd45305557ba21bde49d4415a634a51b36b9419fd3adaffd48fd4d01b514ce

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