Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33121951b2c20f2…

MALICIOUS

PDF

47.2 KB Created: 2021-06-04 00:55:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3c582a2d0f27c9269ec09f2db6012fec SHA-1: 69be4145105dd20d0d38e54fd5c50fe8b4315dd1 SHA-256: d33121951b2c20f256d869bcdf2409c1173e4e2cdad20326247e93dc80daaec4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-generator-game-hack PDF link annotation
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-a-roblox-account-2021_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_off00005164.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5164 29560 bytes
SHA-256: b0ba9d654ca5a2eeb60c8886e7b265fe0ec2d1fc5375397a51a14e0477316a65
font_01_sfnt_off00009658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9658 18116 bytes
SHA-256: 124341eb3a4a3b8bc1f076925fa8461137298bb957754babdcbe9c7592fcce55

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