Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8bf51701af011c…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 00:10:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 435d5601a03f6a9d5913359122bd7db6 SHA-1: 26e5cd27e58ae1465762a35a61f1be092dc65ff9 SHA-256: 2d8bf51701af011c834ec1041e34331f2f7f1e4a9f8404df1158bdf44f604318
182 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. It uses a password-protected-archive 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/hack-coin-master-apk-download-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/halo-roblox-royal-high-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-hack-script-v3rmillion_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-robux-hack-2021-no-survey-no-password_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cach-co-do-free-trong-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/update-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-official-website_GM406889139.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
stream_002_off00002fe3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE3 22464 bytes
SHA-256: 7b88e6ca3f3aaaf0fe6a64273af2f009588c0d38d2d8f32b242c7e135aa5539f
font_01_sfnt_off000061f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F5 18760 bytes
SHA-256: 345ccc7577c06927ea46758c8888bad98130d585e1ba2acf6a86671e882058d6

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