Malicious PDF — malware analysis report

Static analysis result for SHA-256 141caec0a69c7b86…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 08:12:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 522964e4dccfb0182cbed59d3f7b86ed SHA-1: d126051233261d97846c546f1921319fb0dfb44c SHA-256: 141caec0a69c7b86c8dff2a457746cc3bcde98fd02f682ce5583c37d55122beb
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/rewards-roblox-com-game-hack PDF link annotation
    • https://allpromise.com.tw/image/data/files/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-roblox-injectors-list_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/buying-rich-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-hack-roblox-apocalypse-rising-console_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robux-hack_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robloxhack-me-do-you-want-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/roblox-loop-jump-hack_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-pe_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/www-roblox-com-play-for-free_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/can-you-make-a-minecraft-server-for-free_GM479516143.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_002_off000031de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DE 23204 bytes
SHA-256: d922df54b08d90dfc61a1cfd4164083c52db6a95ba0dc388d6999d37fe3a2873
font_01_sfnt_off0000668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 19084 bytes
SHA-256: 072eee2cf5de68af9442ae7b5ce03647f651566b237e5c3ca6269a0d5384abfe

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