Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc42e8cb38fe362…

MALICIOUS

PDF

44.1 KB Created: 2021-05-17 01:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 768681a46a75938a53f9b5d196cb9968 SHA-1: 51136382cf6f1dd93a21f72af29c7378c0e2ee79 SHA-256: 6dc42e8cb38fe36226941cc98bfb36216d3caf56619651ac7f7637b9e7ce2476
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, that point to websites offering free game currency and accounts. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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-roblox-accounts-2021-with-robux-game-hack
    • http://stroybelan.ru/images/free-coin-master-spins-for-today_GM406889139.pdf
    • http://stroybelan.ru/images/free-minecraft-texture-packs_GM479516143.pdf
    • http://stroybelan.ru/images/free-robux-cards_GM431946152.pdf
    • http://stroybelan.ru/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://stroybelan.ru/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://stroybelan.ru/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdf
    • http://stroybelan.ru/images/coin-master-spin-link-today_GM406889139.pdf
    • http://stroybelan.ru/images/how-to-get-free-robux-generator_GM431946152.pdf
    • http://stroybelan.ru/images/earn-free-robux-for-roblox_GM431946152.pdf
    • http://stroybelan.ru/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://stroybelan.ru/images/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • http://stroybelan.ru/images/freerobux-co_GM431946152.pdf
    • http://stroybelan.ru/images/how-to-hack-coin-master-using-es-file_GM406889139.pdf
    • http://stroybelan.ru/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://stroybelan.ru/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://stroybelan.ru/images/minecraft-114-4-download_GM479516143.pdf
    • http://stroybelan.ru/images/free-robux-codes_GM431946152.pdf
    • http://stroybelan.ru/images/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://stroybelan.ru/images/free-robux-safe_GM431946152.pdf
    • http://stroybelan.ru/images/roblox-top_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad6.bin
46c962a18257d0f84b2571d73a4cfd9dff21c3c84717a6acdd0ccbfde2e29086
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD6 25964 bytes
font_01_sfnt_off000087c8.bin
a3899638bf51e335cbc40673d1471e0832e9a39f88469ef4ed0809ba61e6f618
pdf-font-stream PDF embedded font (sfnt) at offset 0x87C8 19076 bytes