Malicious PDF — malware analysis report

Static analysis result for SHA-256 78579fe3ec740406…

MALICIOUS

PDF

51.5 KB Created: 2021-05-16 16:49:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 32e872177afdebe153ce02ad78e6db30 SHA-1: aa640b191a6ab1317091474092ba432b38cc6d8d SHA-256: 78579fe3ec7404065c26949d8a6c691929d30d81a29971b8417934606247756e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or 'game hacks' as a lure. The document body, though partially corrupted, contains a URL pointing to a similar lure. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9300

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.xyz/app/431946152/where-to-get-free-robux-game-hack In PDF document text
    • http://mountain.mn/uploads/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/robux-website_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/getrobux-now_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/aimbot-download-roblox_GM431946152.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
stream_003_off00004c03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C03 28032 bytes
SHA-256: c1a0f6ad1e7f719a62f0329f3416909646fa02e0d16cd27d41aa1d4a75911b27
font_01_sfnt_off00008c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C04 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000a6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D3 18484 bytes
SHA-256: fb52c80d186d334eb1da06902c7e87ffbc7c7b48a2b49bbb6429fdd2e0d05906