Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7364fa7ba5d0fc…

MALICIOUS

PDF

44.1 KB Created: 2021-06-04 01:26:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e93fe2707ead482bd6d56715831454c SHA-1: 31c75890a356af08178b0dbb37711e526193b807 SHA-256: ff7364fa7ba5d0fc5ec77147f70eddb4cea4e8bb44d516968931103fc7a3fd6c
182 Risk Score

Malware Insights

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

This PDF document employs a lure related to 'free Roblox toy codes' and impersonates the Amazon brand to entice users to click on a malicious link. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://netcdn.online/app/431946152/free-roblox-toy-codes-game-hack, which is likely used for credential phishing or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-roblox-toy-codes-game-hack.
  • 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 https://netcdn.online/app/431946152/free-roblox-toy-codes-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-as-a-kid_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
stream_004_off00004ff6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF6 25804 bytes
SHA-256: 86863b2e3713a3d71b38368d962869fecfa2b47b6d9e36fa708c779064f92cdd
font_01_sfnt_off000089a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A5 18300 bytes
SHA-256: 61c572cb3620b4cd8f14a1e394f9b91f9f748a9789523e43842f9c1d8904fae7

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