Malicious PDF — malware analysis report

Static analysis result for SHA-256 99792727ac9d850d…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 19:00:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c6ae8b82a68acb8d31a6048c1b843215 SHA-1: c6e7775ea2d8a9943aa078146e9fb7547ca67fa7 SHA-256: 99792727ac9d850d99c5ec8f8fec97fd148f16193801a80b44503ff80bf16ebc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-hack-roblox-accounts-on-phone-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/cheat-engine-hack-roblox-rpg_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-muslce-tshirt-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-if-join-group_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/earnrobux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-on-meep-city_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-robux-on-robloxxxx_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-make-vip-servers-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-stuff-on-roblox-hack_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_off00002fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB9 22156 bytes
SHA-256: c8ca2de91f3be616d82740dc198b818d904c2b44f99a4b1d59c8984b80714072
font_01_sfnt_off0000608d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 19384 bytes
SHA-256: 084794c69c3a15ed1330993b6e362ce24a67b8c731d0da79d42958a9f82904df

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