Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6854dd08220bcbf…

MALICIOUS

PDF

34.1 KB Created: 2021-07-07 00:32:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 007b229419391812888ba3ab681d563f SHA-1: a7e5c24927bdef2ab7241f71416001095a6e4817 SHA-256: d6854dd08220bcbf04ff047688e30380793bdff6fc5f0d047cff6ca078f1fa54
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/431946152/hacks-para-roblox-game-hack PDF link annotation
    • https://sensorcamera-tw.com/upload/files/hack-tool-for-any-game-on-roblox_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-legitimately-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-lumber-tycoon-2-money-hack-download_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-hack-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-roblox-clothes-names_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-generator-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-trick-deutsch_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/letra-de-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-hack-roblox-to-get-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
font_00_sfnt_off00003176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3176 21592 bytes
SHA-256: b3b307398a8fab873580fb17b93b82dc85dc374b9aec56ee234c4e380d2f4172
font_01_sfnt_off000060c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 18808 bytes
SHA-256: 18c04ed6d416389464b421298170c47648070a4b7ff5aa0adb6f039d676fa700

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