Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d4d473e1ffe2c8…

MALICIOUS

PDF

43.2 KB Created: 2021-05-13 19:45:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 587ef5c31af8093b36c4db8a0330c0a8 SHA-1: 9776797216d596b7053169c3dc3f82b7f5837bcc SHA-256: 70d4d473e1ffe2c8192b7d2b5c979da37383c7e163f9b7f87504869e453cf1f0
182 Risk Score

Malware Insights

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

This PDF document is designed as a social engineering lure, presenting itself as a 'game hack' or 'free generator' to entice users into clicking malicious links. The document body and heuristics indicate a strong focus on directing users to external URLs, including a link farm of PDF files hosted on smark.com.tw, likely for SEO manipulation or further redirection. The 'ClickFix' heuristic suggests the document may also attempt to trick users into executing commands directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.xyz/app/479516143/hacks-for-minecraft-windows-10-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-gainer_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-daily-free-spins-link_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_003_off000049ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FF 25856 bytes
SHA-256: 8dd531cf3b954ff1e6ad11d3221039e2d2bd60307bfada4cd9473f071c4efcd4
font_01_sfnt_off00008554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8554 18696 bytes
SHA-256: cd39c091a68a2846e65319e0aedb696a747600c4d9ed3e222f28c6d266d57a0c

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