Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a42aa164e68bd1…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 23:00:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 39e19f94c47e2550c641b762233c9b63 SHA-1: 191761fc458a27d3c0c4c5edc726ec85d60e337b SHA-256: b9a42aa164e68bd1f811614d7327d4ba90231f8f9d197c6345d7b3d56545fe12
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generator / game hack' lures. The primary IOC is the redirector URL http://netcdn.tw/app/431946152/robux-codes-generator-no-human-verification-game-hack, which is known to host malicious content. The document body and embedded artifacts do not contain executable scripts, but the presence of malicious links strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/robux-codes-generator-no-human-verification-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-a-tycoon-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-critical-strike-secrets-cheats_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-install-sandbags-777s-eyeball-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-on-pc-october-24th-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-without-verification-2021_GM406889139.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/good-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-on-pc-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-para-todos-los-juegos-de-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/kick-players-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-models-in-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/bebe-rexha-i-got-you-cheat-codes-remix-roblox-id_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/files-blue-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/haktuts-coin-master-spins_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_002_off000030dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DD 22624 bytes
SHA-256: b75e03da428b355c57ad68e277c6f4392be920c37f2f76703ec0353229dadc8e
font_01_sfnt_off00006315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 19344 bytes
SHA-256: d97a6452949562d75530f92f626f1cbdf04310b8890864793c0fa9c83aa1390d

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