Malicious PDF — malware analysis report

Static analysis result for SHA-256 412ae03c527e48d7…

MALICIOUS

PDF

42.3 KB Created: 2021-05-13 05:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 57e990c3f6868e4c9e97ad03567cb15a SHA-1: 202d7e02cb3858b798113f3d33edd92805f31a4c SHA-256: 412ae03c527e48d7dff35d2e1ca39d29bc899e381dba431ee93b8c975d737c4d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to sites offering 'free Robux' or game hacks. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action button further supports a deceptive intent. The primary goal appears to be luring users to click these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-robux-no-verify-game-hack
    • http://76remont-kvartir.ru/images/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • http://76remont-kvartir.ru/images/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://76remont-kvartir.ru/images/easy-free-spins-coin-master_GM406889139.pdf
    • http://76remont-kvartir.ru/images/robux-free-c_GM431946152.pdf
    • http://76remont-kvartir.ru/images/coin-master-free-spins-link-iphone_GM406889139.pdf
    • http://76remont-kvartir.ru/images/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • http://76remont-kvartir.ru/images/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://76remont-kvartir.ru/images/coin-master-game-for-pc-free-download_GM406889139.pdf
    • http://76remont-kvartir.ru/images/orewards-com-free-robux_GM431946152.pdf
    • http://76remont-kvartir.ru/images/coin-master-free-rewards-link_GM406889139.pdf
    • http://76remont-kvartir.ru/images/free-robux-no-survey_GM431946152.pdf
    • http://76remont-kvartir.ru/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • http://76remont-kvartir.ru/images/roblox-free-robux_GM431946152.pdf
    • http://76remont-kvartir.ru/images/roblox-18_GM431946152.pdf
    • http://76remont-kvartir.ru/images/coin-master-free-spins-no-generator_GM406889139.pdf
    • http://76remont-kvartir.ru/images/free-robux-no-verification-at-all_GM431946152.pdf
    • http://76remont-kvartir.ru/images/hack-coins-in-coin-master_GM406889139.pdf
    • http://76remont-kvartir.ru/images/heroes-online-roblox_GM431946152.pdf
    • http://76remont-kvartir.ru/images/minecraft-pe-hack-client_GM479516143.pdf
    • http://76remont-kvartir.ru/images/minecraft-classic-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000490d.bin
0b14a1be2690d6920615254185c43535a77039a39495bfa61657e052c61e333d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490D 25632 bytes
font_01_sfnt_off0000826a.bin
c82a2e535d1b02ce633786be567827726fc21df48f71ae9cb05a1d9866072f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x826A 18448 bytes