Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffd81c7a2bafb31…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 00:19:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2d20d5f45b8c22dbace1d46c4cf5766e SHA-1: 0e723727f4c60852ec0a5ffde43cf529b7f88a8e SHA-256: 7ffd81c7a2bafb31df9b20e506a5a04d8ec47968f3ff0f77a7def14c2b798ebe
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free generators to entice users to click on malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts a large number of SEO-optimized PDF links, likely serving as a link farm or a distribution point for further malicious content. The document's structure and embedded URLs strongly suggest a phishing or scam campaign aimed at driving traffic to potentially harmful sites.

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.co/app/431946152/how-to-make-t-shirts-on-roblox-free-sell-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/roblox-how-to-hack-phantom-forces_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-exploits-for-roblox-online_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-truley-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-on-iphone-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-fly-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-hack-in-roblox-2021-may_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-exploit-executor-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-speed-hack-on-any-game-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/swiftbucks-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/every-roblox-item-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/generation-for-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hack-free-spins_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_off0000324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324C 22220 bytes
SHA-256: 3e2d7b690205797928e1989e7db82ccbcf4c27da6642c323b81e0f5bf8ff5515
font_01_sfnt_off000063ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 19572 bytes
SHA-256: 826acf1fb3b743533d5dd4d565350753e7468b5b0e2aa11ee4273d3a02bc3f24

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