Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4247cf103eccaa7…

MALICIOUS

PDF

35.5 KB Created: 2021-06-20 12:34:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4205b9743264a9957d9b22226e481c38 SHA-1: 6c3cca3b414a72ecd29c8eb3aef1aae5c9ca3555 SHA-256: b4247cf103eccaa75af278e5138d5fd7ed3be78231ab3a778c828e12802d5785
220 Risk Score

Malware Insights

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

The PDF contains numerous links designed to lure users with promises of free game currency and hacks, specifically for Roblox. These links redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a scam aimed at tricking users into visiting potentially harmful sites, likely to download malware or engage in further phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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.co/app/431946152/how-to-get-free-robux-easy-on-iphone-game-hack In PDF document text
    • http://library.sdkmaterdei.sch.id/repository/hacks-de-roblox-para-tener-infinitos-robux-gratis_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/auto-clicker-free-roblox-shinobi-life_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-admin-commands-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-2-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/como-descargar-roblox-hack-para-pc_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-unlimited-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-pet-simulator-hacks_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-download-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/hack-for-pet-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/hack-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-roblox-creator-packs_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/new-hack-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-roblox-bc-for-free_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-be-vip-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/hack-robloxcom-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-dubliezieren-hack_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_002_off000030dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DD 23060 bytes
SHA-256: 144e60fb14cd240c9bbca2fccbb9c403048806cd5fd55a4e710c040e9f29c2cc
font_01_sfnt_off00006494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 19504 bytes
SHA-256: 6182d42f52c868dcd6154dba4fc23d80f14c166340d812e8cc80a14daf685560

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