Malicious PDF — malware analysis report

Static analysis result for SHA-256 76421fa1901ddedb…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 01:41:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ac568d4c7eebcc7f30238157153826ba SHA-1: 8b7aa7b52e518bb33158def880ab694170830968 SHA-256: 76421fa1901ddedb1003b326475d0520898f22d6585a2d82181ae07dd8cf3a2d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed to lure users into clicking links that lead to game hack generators and other potentially malicious content. The document contains numerous links to external PDF files hosted on 'tw-storage.com.tw', forming a link farm, and also directs users to a known malicious redirector at 'netcdn.tw'. The primary intent appears to be driving traffic to these sites, likely for ad fraud or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-apk-hack-35-8-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-roblox-arsenal-hack-executor_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-in-a-game-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-use-cheat-engine-on-roblox-without-shutdown-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-hacks-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-phantom-forces-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/what-is-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-roblox-with-hackbar_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-jailbreak-infinite-money-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-on-roblox-meep-city-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E4 22672 bytes
SHA-256: 341130e5f47f023e00ad8d3e27b1805d6c17c087c71052960e479a629ea8a10c
font_01_sfnt_off0000631e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 18696 bytes
SHA-256: 37466016b432fe2c4302c226887fb4a123f095adabdcdeca05fa6b35b2ac340f

Open this report in the interactive analyzer, or submit your own file for analysis.