Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e6777a85874f5…

MALICIOUS

PDF

35.0 KB Created: 2021-07-01 15:48:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3fcd5237891b3834820ca39553033ef4 SHA-1: dbeec01c1ac8f784d43ef57154586fa0bc3c9ddd SHA-256: 5b9e6777a85874f53e348ccfc6a77c14b37ff14dee853f0f89b676a4b1dbc4b4
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/how-to-get-free-clothes-on-roblox-without-bc-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-how-to-get-admin-for-free_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-play-heroes-online-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-play-roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-games-that-will-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-halloween-outfits-free_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-apps-that-work_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
font_00_sfnt_off00002fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFF 22560 bytes
SHA-256: 3dc549be66485bd21cc37a62ee887cfc7996ed1da9fb36a0401074a51059267d
font_01_sfnt_off0000624c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 19544 bytes
SHA-256: 36ee61e16854256462a81d04ceaa68cc5ffbb0b544b39395a458120f32214147

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