Malicious PDF — malware analysis report

Static analysis result for SHA-256 41624cb40dd907d4…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 00:26:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67cce752cbe97a367b1ecbbc1cefb995 SHA-1: 1846c80b3554bfc6ee774ff27436f1e7a4454e76 SHA-256: 41624cb40dd907d4da27e3649624a11e4cb777a82d8d84921906a53086986196
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.co/app/431946152/telecharger-roblox-hack-apk-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-bc-roblox-code_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/is-tiktok-free-on-iphone_GM835599320.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hack-jailbreak-roblox-2021-krankheit_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-hair-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-cheat-in-roblox-eep-city-starball_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hack-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/esp-hack-roblox-pastevin_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-lol_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-ranks-up-in-a-roblox-group-hack-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E81 23124 bytes
SHA-256: 0b1320dde7421631bdaa3bcb093a091b54e953dd9c0fc029d68336e89961fdc3
font_01_sfnt_off00006268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6268 19000 bytes
SHA-256: dc9cf30999ab5bf8380be865896d18a6f948850500a62f7fbfed4ee82a6be41c

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