Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41616117a08106d…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 01:17:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 54821ef55a0a3a06eb8c357063e6f0cc SHA-1: 7a0418b2f5e9158dae44f201ca24edbf9e2fb301 SHA-256: c41616117a08106d416c8ba48f21f92736706fa83bf682561482ee6b66bdbd0d
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, which are known to lead to redirector infrastructure. The document's content and embedded links suggest an attempt to deliver malware or facilitate further malicious activity, likely through a downloader or exploit. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/hack-2021-roblox-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-executor-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-tiktok-followers-quora_GM835599320.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-2021-free-spins-link-2021_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
stream_004_off000050e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E9 25852 bytes
SHA-256: 3d0d283e2ebbbf9400872b03c16073a9469ee2d63137bffa4ef7b425f463bfde
font_01_sfnt_off00008ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDB 18584 bytes
SHA-256: 46c99a86a9d5a603f16c0915e6ab92483eb07d28c14f6ebd23d4457705194ddb

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