Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc870073bb41e7dd…

MALICIOUS

PDF

45.7 KB Created: 2021-05-14 15:43:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 15d6234654e1bf33c7f68646979f39e1 SHA-1: 5f441264a4090d112ea1c92ace45cfd18ec092a1 SHA-256: bc870073bb41e7dded97e764d8ae948f10913c55adf169bdf70549dcdbac98c1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to drive traffic to external sites. The document body and extracted URLs indicate a lure related to "free Robux" or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it may attempt to download or redirect to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/can-u-get-free-robux-game-hack
    • http://pianoservice.com.ua/images/how-can-u-get-free-robux_GM431946152.pdf
    • http://pianoservice.com.ua/images/how-to-hack-minecraft-pe_GM479516143.pdf
    • http://pianoservice.com.ua/images/get-free-spins-coin-master_GM406889139.pdf
    • http://pianoservice.com.ua/images/coin-master-free-spins-fb-champion_GM406889139.pdf
    • http://pianoservice.com.ua/images/free-roblox-gift-card-codes-2021_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-master-hacks-2021_GM406889139.pdf
    • http://pianoservice.com.ua/images/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • http://pianoservice.com.ua/images/roblox-studio-free-robux_GM431946152.pdf
    • http://pianoservice.com.ua/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdf
    • http://pianoservice.com.ua/images/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://pianoservice.com.ua/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • http://pianoservice.com.ua/images/spin-and-coin-link_GM406889139.pdf
    • http://pianoservice.com.ua/images/coin-master-spins-hack-iphone_GM406889139.pdf
    • http://pianoservice.com.ua/images/free-robux-gift-card-codes-2021_GM431946152.pdf
    • http://pianoservice.com.ua/images/i-robux_GM431946152.pdf
    • http://pianoservice.com.ua/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://pianoservice.com.ua/images/coin-master-hack-pc-2021_GM406889139.pdf
    • http://pianoservice.com.ua/images/roblox-hack-com_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-mast-hacks_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047ac.bin
b1b5193fe9872df4d40f44e38ec969ee1a611a929839060cea89738128e89312
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AC 25344 bytes
font_01_sfnt_off00008220.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8220 5696 bytes
font_02_sfnt_off00008f32.bin
35bb0f01f69d1b5e790ed5f4c0eeb98998139975dc1eb58b588dc01b9002bbc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F32 18532 bytes