Malicious PDF — malware analysis report

Static analysis result for SHA-256 5666da5e3d568a8a…

MALICIOUS

PDF

32.7 KB Created: 2021-06-29 22:04:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c43cb4bcdc62c8f0cd9ba5c12369b9db SHA-1: 7236fdcc592bcb8b67ba530c082fbc630c009e8f SHA-256: 5666da5e3d568a8ad00ec6a7a03d79366e0c762cbaebec6a81113f0e833c79e9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to websites offering game hacks and free currency, such as 'roblox-free-2021-game-hack'. The document body and embedded links strongly suggest a phishing or scam attempt, likely to lead users to malicious sites or download further malware. The presence of multiple links to external PDF files, many with numeric slugs, indicates a link farm SEO strategy to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/roblox-free-2021-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/aplicacion-para-hackear-roblox-i-tener-robux-infinitos_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-2021-september-no-human-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-pour-recuperer-son-conte-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-spiel-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-stormtrooper-helmet-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-legit-no-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/infant-roblox-free-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-points-redeem-free-gift-cards_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-inspection-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-for-pf-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheat-sur-tout-les-jeux-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/images-of-john-doe-hacker-roblox_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_off00002a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A9A 21880 bytes
SHA-256: fc04ba2728b9e1d355dbe89792e61c0a477675b1d463f273ab52fe6caaa4ac02
font_01_sfnt_off00005b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B04 19052 bytes
SHA-256: 1adbeadc1938b36678ae695010fe18f73b2c565444d1f89c2573eec72ca93a2b

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