Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1308ad051eb715…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 04:23:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: eb697407cbbdd3a6d12d0a548b63a660 SHA-1: 5b20cec2915057103d5a7b0c0cc6630439d98bb6 SHA-256: 6c1308ad051eb7152f236a440688f626697bc9106e5d658f2ce8d00a44d8113c
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 0.9980

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 http://netcdn.tw/app/406889139/coin-master-fb-free-spins-link-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-roblox-with-proof_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-view-code-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-gamepasses-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-giver-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/interfaz-de-hack-de-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-champion-shirt_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/linkmon-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/como-hackear-la-cuenta-de-tu-amigo-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-survey-2021-working-august_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-is-bloxburg-free_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_off00003077.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3077 22880 bytes
SHA-256: 81455f44013bd9ea4bfabef6fa98507f62aae05675b1f6b8661084acc8b242d9
font_01_sfnt_off00006394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6394 18504 bytes
SHA-256: 6fae6f2ed4f6bec01b64d1670d3a971b1a45bf61d7518176b6a7fdaf35e32234

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