Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3aaed112efa76e…

MALICIOUS

PDF

41.4 KB Created: 2021-05-04 03:00:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 89eab553c6a82bd1a1117074c66bc7a3 SHA-1: 3b282901b994232051bcfca6d38492aac122c2b6 SHA-256: ec3aaed112efa76e7657b1b35d62d78b2f433e82be733bdf48b7cf5ffc66eb22
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' or 'game hacks', which are common lures for phishing and malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further payload delivery.

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/linkmon-free-robux-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/hackaron-robux.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-exploit-scripts-free-download.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-working-november-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-promocode-give-you-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-100-real-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-promo-codes-in-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-adidas-sachen-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-roblox-yammy.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/downlode-a-roblox-hack-tool.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/claim-gg-free-robux.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_003_off0000412e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x412E 27636 bytes
SHA-256: b30d31cf168ba27ff2f2314e04057d100ec9a90829fc80557a1100d0b80aa54b
font_01_sfnt_off00007f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7B 18564 bytes
SHA-256: 3b385d76ea241617f18508f8334ab198fabbbf7eb43c0e31c06121e8197890cd

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