Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6426bcdd484855…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 08:04:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4ca887d31ed92218689845fad8e711f7 SHA-1: 83a7a1a78a2f63c35884c2dd1f73bdb3446ad91c SHA-256: bd6426bcdd484855f6b4fe2a4f0ec1524ab3526ad065f893c19e4977da20b03e
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/431946152/roblox-getting-hacked-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-a-free-bag-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-roblox-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/antihack-protection-v1-reviews-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-counter-blox-roblox-offensive-hacks-very-op_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-xrad-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-your-friends-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-nocliping_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/if-roblox-was-free-part-2_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-rbx-2021-june-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/wewgaming-hack-roblox_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_off00003185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3185 22012 bytes
SHA-256: 5e0959b8cf26f35e5e2dbfc7720e3b3c925a51af44b4469bea4057da5a102282
font_01_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 19052 bytes
SHA-256: 40ffffdef6ff8033747f259b496af0e51358a7682ccc7aa35e83597db0279c32

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