Malicious PDF — malware analysis report

Static analysis result for SHA-256 11caffe994e19318…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 02:09:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b16add9594c54641c6c04754403faee3 SHA-1: e376aecd9010e017496c738c19807ae9cf4eabfd SHA-256: 11caffe994e19318efc40adf0cd788f0a79d0486a622b567ac55004261c26675
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts numerous other PDFs, likely serving as a multi-stage lure or downloader. The document body contains obfuscated text and URLs, indicating an attempt to conceal its malicious nature.

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-mast-hacks-game-hack In PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/robloxmania-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/pubg-uc-shopee_GM1330123889.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/download-free-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-coins-today_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_002_off000031e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E8 22864 bytes
SHA-256: 378ded297ec01227faf149d59cb6bd9037a0ece76aa68f279950e2a2dcff10f0
font_01_sfnt_off00006544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 18004 bytes
SHA-256: 9d95a6a02b99d49185e57d1486a892a1617eeb29a1263c5cbf44862ce121196b