Malicious PDF — malware analysis report

Static analysis result for SHA-256 941e53f84a17d910…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 10:51:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c72d063ed1900590e5f534b7b9e0cde SHA-1: d9875543eee2c6ff385141edc66384f6d97a7939 SHA-256: 941e53f84a17d9106debcb462ec070f24a6cde1e03f8327283c4ff37fa7df633
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be SEO-optimized for game cheats and free offers, indicating a link farm or SEO spam campaign. One of the embedded URLs, 'https://netcdn.tw/app/431946152/roblox-bee-swarm-simulator-tabby-bee-cheat-game-hack', suggests a lure for game-related content. The presence of a 'Download Now' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-bee-swarm-simulator-tabby-bee-cheat-game-hack
    • https://www.tsdb.com.au/images/windows-10-minecraft-free-with-java_GM479516143.pdf
    • https://www.tsdb.com.au/images/claim-free-spins-coin-master_GM406889139.pdf
    • https://www.tsdb.com.au/images/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdf
    • https://www.tsdb.com.au/images/free-tiktok-accounts_GM835599320.pdf
    • https://www.tsdb.com.au/images/coin-master-hack-tool-access-online-generator_GM406889139.pdf
    • https://www.tsdb.com.au/images/minecraft-free-no-download_GM479516143.pdf
    • https://www.tsdb.com.au/images/free-robux-no-downloading-anything_GM431946152.pdf
    • https://www.tsdb.com.au/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • https://www.tsdb.com.au/images/coin-master-download-hack-ios_GM406889139.pdf
    • https://www.tsdb.com.au/images/coin-master-hack-activegamer_GM406889139.pdf
    • https://www.tsdb.com.au/images/free-minecraft-server-maker_GM479516143.pdf
    • https://www.tsdb.com.au/images/free-robux-download_GM431946152.pdf
    • https://www.tsdb.com.au/images/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • https://www.tsdb.com.au/images/free-roblox-hair-girl_GM431946152.pdf
    • https://www.tsdb.com.au/images/unlimited-robux_GM431946152.pdf
    • https://www.tsdb.com.au/images/how-can-u-get-free-robux_GM431946152.pdf
    • https://www.tsdb.com.au/images/dungeon-quest-roblox-hack-download_GM431946152.pdf
    • https://www.tsdb.com.au/images/free-spin-hack-coin-master-2021_GM406889139.pdf
    • https://www.tsdb.com.au/images/op-rewards-free-robux_GM431946152.pdf
    • https://www.tsdb.com.au/images/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055db.bin
d24e08aa8b23370447e4a47a59513270568fa592886a7b456313dbcd54004dcc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55DB 24348 bytes
font_01_sfnt_off00008dde.bin
f01acc160ef1393137cd7a90315dbabef2de3b2672caff7b486b43975190684a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDE 2976 bytes
font_02_sfnt_off0000981d.bin
cba3e7c2de2482cedd3565a410fd07c609e9aabe26fe750bb95b8aab5d6a834b
pdf-font-stream PDF embedded font (sfnt) at offset 0x981D 19148 bytes