Malicious PDF — malware analysis report

Static analysis result for SHA-256 940d8fc1fc7d8599…

MALICIOUS

PDF

43.5 KB Created: 2021-06-07 20:05:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7ffa6e872424451fd4b90125d4d02106 SHA-1: bc509e9c8ed894456314e40bc8c25fb25755517a SHA-256: 940d8fc1fc7d85992a970cd3b69006509fd8544a36b1423e7fba651aa6723c1b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA 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 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-download-game-free-game-hack PDF link annotation
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/pokemon-go-accounts-free-list-2021_GM1094591345.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/bleu-hack-roblox-download-free_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/watch-ads-for-robux_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
stream_004_off00004e33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E33 23992 bytes
SHA-256: a58b3575f10bc4e3cf8cce4933fc9b4839aaa168e1c2c3d86683154f7d9c4aba
font_01_sfnt_off0000851e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851E 18944 bytes
SHA-256: 428c93e826bf7fa20bc40a624ee733779147724dd234d15542c7790ebf1ebdb6

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