Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adf1d1efe839d37…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 09:57:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f9272860830dd306d8578d644827b3ee SHA-1: 61d741b5487108db8c45f703caffe0bdfcd1f83a SHA-256: 4adf1d1efe839d371952b2d69da99c12c01416fcc936438f80bbb12955a293a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a lure related to free game currency ('Robux') and hacks, directing users to a known malicious redirector. The document body and embedded links strongly suggest a phishing or scam attempt to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/431946152/how-to-get-free-robux-easy-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-items-in-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-women-free-hair_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-casper-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/3-letter-roblox-accounts-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-free-admin_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-make-a-private-server-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-apple_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/ninja-legends-roblox-script-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-obc-and-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/donating-free-robux_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
font_00_sfnt_off00002df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF1 22624 bytes
SHA-256: 01a85c360ecaded4cbe8d07fd70332f004bdeb408515f821ed20dd1a840b9636
font_01_sfnt_off0000609f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609F 19164 bytes
SHA-256: 0d91da27a3fd2071a1294b90674c0de4394c4ddf99a76a86a264892d4088a75d

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