Malicious PDF — malware analysis report

Static analysis result for SHA-256 a154cdbfd40aff9e…

MALICIOUS

PDF

41.0 KB Created: 2021-04-30 06:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b5cdbc0a761fa5f5667bbcdf23a8ef8d SHA-1: af42adcbc2d27ec6a647b9585d5f815ab991ff41 SHA-256: a154cdbfd40aff9e03826974309e9c2ef3b9278fed22dadfc93e3e1d67faede3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and free in-game currency for Roblox. The document body and heuristics indicate a lure for a 'free generator' or 'game hack', which is a common social engineering tactic. The embedded URLs are designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/roblox-adopt-me-how-to-get-free-bucks-game-hack In PDF document text
    • http://repository.unla.ac.id/repository/roblox-aimbot-hack.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-free-500-robux.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-change-your-roblox-name-for-free-2021.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-in-someones-account-on-roblox.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/kidnap-cheat-roblox.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-health-hack-download.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/mobihack-net-roblox-hack-2021.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/como-subir-de-nivel-en-roblox-naruto-final-bond-hack.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-free-accounts-with-robux-2021.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-promo-codes-for-roblox-clothes.pdfIn PDF document text
    • https://freerobux.cyouIn 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_003_off000041e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41E1 26064 bytes
SHA-256: 82e9b544d79909fd7aa86f837df922e3a0ed84d12c57ce6d01f36d9c801cf232
font_01_sfnt_off00007c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 19072 bytes
SHA-256: 32c209108e29ba9655f71aa5bec3e2618cef14b2ef4e80dae511b763f210489a

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