Malicious PDF — malware analysis report

Static analysis result for SHA-256 844784ce14f4ecac…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 16:56:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f040edcab4c993f7e622aab900aebf2e SHA-1: 296f12a4ed17cea3771cc0482f1059c507014a37 SHA-256: 844784ce14f4ecac35b6cf2278f177ed796144f926151382efaa9a7bf69b9854
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/406889139/coin-master-hack-100-working-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/cheats-roblox-get-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-ballon-simolator-gem-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/case-clicker-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-build-a-boat-for-treasure-new-hack-unlimited-money_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/cheat-on-roblox-ghost-simulattor_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-spins-coin-master-2021_GM406889139.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_off00003035.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3035 23464 bytes
SHA-256: 0a36aa3efab1f135e91b7487a97a05a48d64d111db16064df5b2653f43f35cc5
font_01_sfnt_off00006543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 18480 bytes
SHA-256: 4deb687acd323bf9668adf7f6443399c29d9f2c86793632556f948df274d5cf0

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