Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6eaa8a59f4a4950…

MALICIOUS

PDF

36.0 KB Created: 2021-07-06 04:34:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 54fad0dbf67f7210ee8df7cfc3b0e5b5 SHA-1: f0a7dae93647f99defb0e1abfc9e6d4b84310dec SHA-256: d6eaa8a59f4a495027b8bfd270481fc80134b338fcc39a57912c1f6623754bcf
220 Risk Score

Malware Insights

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

This PDF document acts as a lure, presenting itself as a game hack generator but containing numerous links to external websites. These external sites appear to be part of a link farm, directing users to more PDF files, likely to increase search engine ranking for malicious content. The primary redirector URL is associated with known malicious infrastructure, suggesting a phishing or malware distribution scheme.

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/479516143/minecraft-tower-defense-hacked-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-without-downloads-hypur_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-money-in-jailbreak_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-breaking-point-script-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-engine-in-virtual-machine_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-no-human-verifacatio-no-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/i-got-hacked-and-cant-play-games-now-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacking-roblox-items_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/group-give-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-exploit-juillet-2021-for-car-crusher-2_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/surf-hack-script-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hackaron-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-how-to-get-japan-sushi-card-free_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_off000036a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36A5 22596 bytes
SHA-256: 2c9142b09f358a5281d5dc5019780c17056bf78c14d36c0908fc20ada5162b47
font_01_sfnt_off00006929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 18672 bytes
SHA-256: 8ef55fb4d9ba038590cd99f97770fa3f244966affa92085fda601291346fb9e1

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