Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c22f1474abfee8…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 09:42:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8f27e000d6ee9ae747bff9dff27de191 SHA-1: 9d9fc4a8041b28602f3cd458e7fc23f46c9ec707 SHA-256: 08c22f1474abfee88eb48fab1fe06be5752bfca9647c7f1354e1171cd4eb03b2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 6

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-unlimited-spin-apk-free-download-game-hack PDF link annotation
    • http://118.98.227.172/opac/repository/roblox-free-generator-no-verification-no-survey_GM431946152.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/hacks-for-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/island-royale-roblox-hack-esp-script-pastebin_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-ways-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-vip-server-roblox-any-game_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/hacking-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-ripull-hacking_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-a-free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/pokemon-go-free-or-alolan-muk_GM1094591345.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/hacks-for-build-a-boat-for-treasure-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-op-weapons-in-your-inventory-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-to-get-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-youtube_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_off00003291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3291 22880 bytes
SHA-256: 911616eb0c5a3ef3e10e3460748aaff43b69add412b04a627fa3a093e4f0036a
font_01_sfnt_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 19368 bytes
SHA-256: 8b0685dcc048d8507013793e7e40f4e8e130d168f30120dc551c0829f220b5a1

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