Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae79415d083b0a7f…

MALICIOUS

PDF

43.5 KB Created: 2021-05-19 17:14:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 38ca9eb44c92b336f13ba29e855a37b1 SHA-1: 0cc51172e56860572927134d365ef12a2e9bd6d9 SHA-256: ae79415d083b0a7f8a303f6ac0ea0082a1ce7392de42f0cea3a44885cb7cd77f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'unlimited spins'. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. The document's content and embedded links suggest a phishing or scam attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/how-to-play-coin-master-game-hack In PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-daily-spin-coin-master-game_GM406889139.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_003_off00004dcd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCD 25688 bytes
SHA-256: 2ef8ceba590dee665976a4c312ce0ca5db30da33508ef4738b5cc1e22d9e4a6a
font_01_sfnt_off0000882a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882A 18116 bytes
SHA-256: 0e8b5a9117de41a6d4fd5ecb0cd728d284290b6e916b566678616dac1dce6f04