Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb553f89c8b0ce8e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 23:14:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: db696220f3acc4e06342ea40a9df3bb9 SHA-1: 1bce16cd158ac2f348b34c56c8ae90b90402b902 SHA-256: cb553f89c8b0ce8e7721a38f679bed31f75d6e29143a9475562ae0fc00e34601
220 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 document contains numerous links to SEO-optimized PDF files and a primary redirector URL, indicating a phishing or scam campaign. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-hack-tool-no-human-verification-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-sketch-roblox-hacked-client_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-expolists-roblox-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-robux-from-someone_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-hack-no-scam_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-gift-card-codes-list-november-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/xyrex-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-human-verification-easy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-human-verification-or-survey-2021-easy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-playing-games-or-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-roblox-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/banning-simulator-roblox-get-all-gamepasses-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-clothes_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
stream_002_off00003170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3170 23560 bytes
SHA-256: 4fd8f02fcf40eb2b9635a3a7c800e0acf94d10c5101c24c4022f6f83637df124
font_01_sfnt_off00006693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 18612 bytes
SHA-256: fd5ef64b15d2b4ae3257e8e3f0ca0e5abd2d6439c19e7b71cdd4d0779896f9bd

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