Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a351be520bb01a…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 19:20:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c9032d63515b9c0261935abe63fcca0 SHA-1: 7cc60bce48ad8203e05242d9c449c149afe31f8d SHA-256: c8a351be520bb01a7447fa1e1cd8c2b9b4e4b25b7a069d63c8503368d92c87e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as 'free Robux codes' or 'game hacks'. The document body and heuristics indicate a lure designed to trick users into clicking these links. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the malicious links suggest a potential for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/free-robux-codes-2021-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/pubg-uc-logo-png_GM1330123889.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_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
font_00_sfnt_off00005396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5396 28344 bytes
SHA-256: 90128f5c6b6e16520ac58e913960662c53f939c894df958385baf7b68c09364c
font_01_sfnt_off000093ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CA 18588 bytes
SHA-256: 0c0011b59677f21f59199ad7d2a82948105ed154610022cedcbab6f052c91d55

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