Malicious PDF — malware analysis report

Static analysis result for SHA-256 739a8c9eb944f920…

MALICIOUS

PDF

36.2 KB Created: 2021-07-06 06:14:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a746a81b2f28751cbd267b139669cbe SHA-1: 4fdc368171af3e22905b7731bf69f8254f5ab753 SHA-256: 739a8c9eb944f92076cdbb219f3abb15cec29de06501f611f97b948ca526309b
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/406889139/free-rare-cards-for-coin-master-christmas-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/youtube-como-ser-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hacked-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/robux-hacks-that-actually-work-for-everyone-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/royale-high-school-roblox-free-play_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-mad-city-vip-server_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-anime-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/buxgg-robux-generator-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pokeon-ultra-brick-bronze-roblox-free-shiny_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-followers-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/robux-games_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
stream_002_off0000365b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x365B 23040 bytes
SHA-256: 98257e695644c6636621553afc82a441bdba2e22967db019c4ed9cad66169684
font_01_sfnt_off00006a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 18600 bytes
SHA-256: 784c5c43db1f59aa9405f56eca204774df99ad96af592b59070832778e8bce4d

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