Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de08c526f8b19b6…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 11:54:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5a9a6eba23734d72bc52b3e8d08369c7 SHA-1: 92489e963171478edb9d765bde4428f07c660dc1 SHA-256: 3de08c526f8b19b666cb7fae468ca7eac713090f54290e5d7320d32c472d374a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, indicating a phishing or scamming attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a potential for further malicious activity, such as downloading additional payloads.

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/431946152/free-robux-scam-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/omega-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pubg-600-uc-price-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hown-to-get-ninja-package-for-free-2021-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hack-for-wieght-lifting-simulator-3-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-accounts-of-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-paying-money_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_off00003450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3450 22064 bytes
SHA-256: c89e94887dd0e51375de614223c503c47d045eaa0659a8b262bf99dcf7673903
font_01_sfnt_off00006553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6553 18976 bytes
SHA-256: cbdc41d8fc228e49ccc7bcfe98298a887040acda9b23f70c8701ba624ab7b4a9

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