Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c5997539fd6924…

MALICIOUS

PDF

45.9 KB Created: 2021-06-09 13:43:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cbc590b2392f8ba4d5b5e97d432172dc SHA-1: 22b142a8ddeabb713b5386689bfa30bce2aca3c0 SHA-256: e4c5997539fd6924e9545a729ec8f896d327784383fc91dad0ff6fa152cd85d9
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 0.9864

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/roblox-hack-v6-5-free-download-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spin-online-tool-coin-master_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_004_off00005335.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5335 25248 bytes
SHA-256: bcc14017e9c08af385f91997d83acf07858d766d137e5841105a68349e6646ef
font_01_sfnt_off00008d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 19288 bytes
SHA-256: 4ba0ca2633f8d32bddd25779dac2448078bb0e3d8bf589a7d70a360aab6ded4f

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