Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a376c6481b85c6d…

MALICIOUS

PDF

33.3 KB Created: 2021-06-26 11:01:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a58fd70e2cf3ee4b838b5c478135c2ac SHA-1: 0041ae2ed9c397b17c035ac9853c51fd19938321 SHA-256: 3a376c6481b85c6d6bb14c55da37fe74c7eb9fd546210524aa1654c2cea63416
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free currency, as indicated by the document body and multiple heuristic firings. It contains numerous links to redirector infrastructure and a link farm, suggesting an attempt to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam campaign.

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/easy-robux-cheat-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-generator-robux-gratuit_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/what-are-the-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheat-roblox-phantom-force_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/jojo-characters-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-intriga-injector-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-online-free-gameplay_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-dll-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/speed-hack-in-any-roblox-game-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/whats-a-code-for-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-iron-man-suit-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification-or-offers_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_off00002c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2F 22056 bytes
SHA-256: ea9a61e3c7663dd99936f19cff9677bc5e98d6dca9d96e3ffd6c8b01e977d7f7
font_01_sfnt_off00005d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 19004 bytes
SHA-256: 4729d25e920c6ea201ad0ac814327d396bafc8a14ef5c72c4f4db0aab3076658

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