Malicious PDF — malware analysis report

Static analysis result for SHA-256 572c2425f48177a0…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 12:19:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 67d50be2a9eb3a5f83b6f068a2aaaeb0 SHA-1: c5431fa7eb84c95ae1c2d883a6c6c70c3d4767ba SHA-256: 572c2425f48177a063ee2e18499c1f963f7eb5e8d05d9d65fef9273ee5ebf08d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure of game hacks and free in-game currency to entice users. It contains a high density of external links, many pointing to other PDFs hosted on `valenciamaids.com`, suggesting a link farm or SEO manipulation tactic. The primary URL `http://netcdn.tw/app/431946152/how-to-make-robux-game-hack` likely serves as a redirector to further malicious content.

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/how-to-make-robux-game-hack PDF link annotation
    • http://www.valenciamaids.com/userfiles/files/free-roblox-lvl-7_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-penguin-costume-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-verification-or-downloads_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-how-to-get-free-gear_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-hack-uk_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/work-in-a-pizza-place-roblox-swim-cheats_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-generator-com-roblox-hack_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_off00002e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7F 22420 bytes
SHA-256: a306ff9e5977b08dfd566d7046a6dedf7142e49ffcb0af87f889bc60cddb3850
font_01_sfnt_off00006085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6085 19084 bytes
SHA-256: d682c2d974d4a0691f251178c8c6bf0bf848f999eb6732f215295c7958dc0a5c

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