Malicious PDF — malware analysis report

Static analysis result for SHA-256 391e875c74f17af5…

MALICIOUS

PDF

37.4 KB Created: 2021-07-06 00:14:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f90a629b62b5b4e77fe12b24628e7a89 SHA-1: b979b1f5327102bde76a1e8770f445e3646c3532 SHA-256: 391e875c74f17af502813594a68ef30f3a5d62cf778081332b0f415bf01f70da
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/free-robux-com-real-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/free-roblox-accountsd_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/moon-active_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/best-hack-guis-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-online-dont-have-to-download-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-download-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-account-with-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/mad-shitter-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-bc-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/case-clicker-coin-flip-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/criminal-vs-swat-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-robux-cheat-engine-download_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_off00003bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BF5 22260 bytes
SHA-256: d7d60fdf7063edf43d51708b813f59db3947c4116c055390d6efcf9d460e1508
font_01_sfnt_off00006d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 19052 bytes
SHA-256: bc7b269ccb6ae3a64d83fc270fb5f4e603085d94a09e100662dabde8c260ece0

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