Malicious PDF — malware analysis report

Static analysis result for SHA-256 df708e88993dd49c…

MALICIOUS

PDF

43.8 KB Created: 2021-05-17 21:30:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2714c0210cb437a7488fcca5cd824996 SHA-1: ea354f28205f2a5f978c2168467e278168928f3d SHA-256: df708e88993dd49c764e3f83ad1ba0622076bc36f9b59debe0c6e4e10b66fa73
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, directing users to a malicious URL. It also contains a large number of embedded links, many of which point to PDF files hosted on cleansui.com.tw, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/how-to-make-your-own-minecraft-server-for-free-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/hack-the-game-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_003_off00004e93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E93 25532 bytes
SHA-256: ff8cd056ed6d0ed0fd8ce1c7c7cbeec4487e038d296048983f9a5f31d788f819
font_01_sfnt_off000088a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A2 18460 bytes
SHA-256: 43abef8b834297908dc205ac191a436a457546b124377fb637ef7db2584f74fc

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