Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4399a9e55cae3f4…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 06:51:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 478a47f5b1449e6d8fc20f437d473227 SHA-1: 717460db2876508843323c86dc4d8b17ba21eb0a SHA-256: c4399a9e55cae3f433c871e87044158a31f5c5c6a736702607452505f16eb8b7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, leading to a "game hack" lure. The document body, though heavily obfuscated, contains references to the malicious URL. The presence of embedded links and the lure suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-extra-spins-game-hack In PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/freecoins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/rbx-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/pubg-uc-2-all-pro_GM1330123889.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/roblox-girl_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_off00004f19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F19 23428 bytes
SHA-256: 575cdd2ee24b6635e33225280806f4cf6ae97874a40770d6aa4539a2c50d619f
font_01_sfnt_off000083d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D3 19260 bytes
SHA-256: 8e285b51e643d5d9a790b523c193537e2006d8c7747aebf8728e9a08eaa3049a

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