Malicious PDF — malware analysis report

Static analysis result for SHA-256 688c57f4a7653f0f…

MALICIOUS

PDF

44.0 KB Created: 2021-06-10 17:19:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0e955a94ae21610fa1dae3e147c91e5d SHA-1: 7327975b89169656477a7bcb7f6750e884d5ff4f SHA-256: 688c57f4a7653f0f89e8caacd37a97d7d918f773bdc3184cb583fc47958a4157
102 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 link farms for popular games like Roblox and Coin Master. The document body, though partially corrupted, contains references to 'free game hack' and a URL pointing to a similar resource. This suggests the document is designed to trick users into visiting malicious sites that likely host malware or phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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
  • 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 https://netcdn.tw/app/431946152/roblox-guest-clothes-free-game-hack
    • http://loriginedupain.org/images/roblox-free-robux-hack_GM431946152.pdf
    • http://loriginedupain.org/images/free-minecraft-server-hosting_GM479516143.pdf
    • http://loriginedupain.org/images/roblox-plus-ultra-money-hack_GM431946152.pdf
    • http://loriginedupain.org/images/getbucks-free-roblox-website-game_GM431946152.pdf
    • http://loriginedupain.org/images/roblox-free-no-download_GM431946152.pdf
    • http://loriginedupain.org/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://loriginedupain.org/images/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://loriginedupain.org/images/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://loriginedupain.org/images/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://loriginedupain.org/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdf
    • http://loriginedupain.org/images/can-lucky-patcher-hack-coin-master_GM406889139.pdf
    • http://loriginedupain.org/images/master-coin-free-spin-daily_GM406889139.pdf
    • http://loriginedupain.org/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdf
    • http://loriginedupain.org/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • http://loriginedupain.org/images/cmaster-club-coin-master-hack_GM406889139.pdf
    • http://loriginedupain.org/images/how-to-get-free-faces-on-roblox_GM431946152.pdf
    • http://loriginedupain.org/images/wahoo-gaming-co-free-robux_GM431946152.pdf
    • http://loriginedupain.org/images/minecraft-ps4-free_GM479516143.pdf
    • http://loriginedupain.org/images/tiktok-likes-free_GM835599320.pdf
    • http://loriginedupain.org/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • https://www.mic
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f9f.bin
c1773d19b85dee1080239253a189d3b53151aae3bb0d6fc597f685e1a003606f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9F 24796 bytes
font_01_sfnt_off00008917.bin
b3bbb0b5655ee163b2e2b06dba5221cebdd9fde956d8c340fb5e8083667cbf17
pdf-font-stream PDF embedded font (sfnt) at offset 0x8917 18360 bytes