Malicious PDF — malware analysis report

Static analysis result for SHA-256 338363f13cc76817…

MALICIOUS

PDF

34.9 KB Created: 2021-06-28 21:28:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bb6871dbc71a6fe416bba1cab3f93469 SHA-1: dbad02b30fcff6a06f65d8b98a80bfe78decbc33 SHA-256: 338363f13cc76817b59742be58e42c443aac4fccbd81b06f26a1416b22125e3c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game hacks, specifically mentioning Roblox and Coin Master. The primary redirector URL is http://netcdn.co/app/431946152/dis666-roblox-hack-game-hack, which is likely used to distribute further malicious content.

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/dis666-roblox-hack-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/free-face-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/jd-roblox-free-knife-code_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-vip-server-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/all-roblox-dance-hacks_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-for-free-generator_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/bux-city-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-accountsd_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-streets-of-bloxwood-remastered-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DA 22156 bytes
SHA-256: cdc9cb60e77d5ccb55cd5919def99c1ccc6d0dbbbab80f418ab4f08b30987b77
font_01_sfnt_off000062e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E8 19112 bytes
SHA-256: 882b759156dde0079fdf0510c430d953e1d4b59cd43ea9fa707a59c9e997d06f

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