Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cf764bc129c8f7…

MALICIOUS

PDF

53.9 KB Created: 2021-06-09 04:27:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da2f5a1f6e5db366cc3aed491b10214e SHA-1: 4e54ba3d12c3ab2c877f188d5d31308b8ad86cc7 SHA-256: 54cf764bc129c8f74e3234ad0ad3adbc421fabb930dae7a9c97604f80492c8bf
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 0.9636

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 https://netcdn.tw/app/431946152/how-to-hack-roblox-money-mac-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/pokemon-go-free-and-defit_GM1094591345.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-injector-2021-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://rblx.landIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000530c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530C 27768 bytes
SHA-256: b635d83721b3637508351b51ed0b6b9abed0b9e595a699214107a5c251c66166
font_01_sfnt_off00009299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9299 8704 bytes
SHA-256: ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490
font_02_sfnt_off0000af04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF04 18720 bytes
SHA-256: 5ae3f64cc304d1e3f3279d77d108eacfa4d0d98238ba4178c9e9b21848eb391d

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