Malicious PDF — malware analysis report

Static analysis result for SHA-256 930211f61da6a0ef…

MALICIOUS

PDF

35.5 KB Created: 2021-06-30 21:22:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10eb65841457b940e4eee6b504a121ff SHA-1: c8c4a3ac48a24687833a2c3fdcb0a2b0c8fd5c76 SHA-256: 930211f61da6a0ef479ff8c0907cd1f824e8ed197df18663a2042a2a6507633f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and in-game currency to entice users. It contains a large number of external links, many of which point to other PDFs, indicating a link farm designed for SEO manipulation. The primary URL, http://netcdn.co/app/431946152/backpack-roblox-free-game-hack, likely serves as a redirector to malicious content or further phishing pages.

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.co/app/431946152/backpack-roblox-free-game-hack PDF link annotation
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-bis_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/comment-hacker-robloxe-facilement-sur-pc-2021-en-francais_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-easly_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-everyting-free-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hacking-on-mano-county-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-not-a-scam-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-coloring-pages-printable-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spin-coin-master-2021_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
font_00_sfnt_off0000343b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x343B 22608 bytes
SHA-256: f8ed60730b4e30e1ac6355909b64fe4e0d428e68ea28713242384af44b82bbf2
font_01_sfnt_off000065f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F4 18996 bytes
SHA-256: 9b88780b4b02378140a6d26491d0305974703b9fc1d4c13f2fd74ec182bea2d9

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