Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a9eacf251936ac…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 10:10:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b4161380da44a299cc26ba6ea85571d0 SHA-1: 8066fcce09f71f7fd61084b21752cc58167ad6c3 SHA-256: b8a9eacf251936ac8d8879114229c7ca30c43e5ffa8157c7151c919cc4d0c7ca
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files related to game hacks and cheats. The primary lure appears to be 'Coin Master Daily Free Spins Link 2021 Today', directing users to a malicious redirector. This indicates a link farm or SEO poisoning attack designed to drive traffic to potentially malicious or scam-related content.

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-daily-free-spins-link-2021-today-game-hack PDF link annotation
    • http://new-era.com.tw/image/data/files/free-robux-100-real-no-fake-roblox_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-robux-instantly-no-cache-legit_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/get-free-neon-blue-animal-hat-on-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/metalmiami-roblox-hack_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-hack-roblox-jailbreak-youtube_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/roblox-sword-fight-on-the-heights-original-how-to-hack_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/freerubux_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/admin-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-make-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-roblox-outfits-2021_GM431946152.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
font_00_sfnt_off00003017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3017 22576 bytes
SHA-256: 6a655b640ce475822a15696df900448a767ea793fb9b0312e8bf483267cf7202
font_01_sfnt_off0000625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 19344 bytes
SHA-256: 2b65a240a25012a699619f5b44b4403fb2d70dbe90fc6d16a4cece9e458288ef

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