Malicious PDF — malware analysis report

Static analysis result for SHA-256 b789b0b3918a04e1…

MALICIOUS

PDF

32.2 KB Created: 2021-07-03 11:24:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6316ebd21ffb3ad8a753c0d9cb038b1c SHA-1: eb491b08bb14ed907a9c8c4635a7ab32c533bc6a SHA-256: b789b0b3918a04e125772ecd077c7a91699bfabaeeb0554916a7587f8304bf53
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body explicitly mentions 'Robux Free Ap' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', indicating a lure for game-related scams. The presence of multiple PDF links and a critical heuristic firing for malicious redirector infrastructure strongly suggests this document is designed to lead users to potentially harmful content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/robux-free-ap-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/tiktok-free-view-like-video_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-upload-multiple-music-to-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-para-comprar-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/tiktok-free-pizza_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-hack_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
font_00_sfnt_off00002994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2994 21696 bytes
SHA-256: 48f66ffb9472c3ea27f0f81f2db7b1e5d894eab145a53d52c28f951c98df4653
font_01_sfnt_off0000597b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x597B 18892 bytes
SHA-256: 8ff078739a673ddce19ab48a630acbfe3a65a2f957bdd033c4c17e86912cd4c5

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