Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a7de6047e9c4cc…

MALICIOUS

PDF

44.8 KB Created: 2021-05-17 05:36:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c8cba11dd3157f6a4da5abc8023bd909 SHA-1: 26dd7063d70e2844b104972963acf4c73b7dbc9b SHA-256: 63a7de6047e9c4ccbce85cf7a9e5eccf1785d9c2ed8159024194e8c0625e5a83
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to external resources related to games and hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest malicious intent. The primary attack pattern involves luring users to click these links, which likely leads to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/roblox-free-robux-codes-game-hack
    • https://www.romedia.gr/images/coin-master-free-spins-link-2021-app_GM406889139.pdf
    • https://www.romedia.gr/images/how-do-you-get-free-food-in-coin-master_GM406889139.pdf
    • https://www.romedia.gr/images/free-robux-group_GM431946152.pdf
    • https://www.romedia.gr/images/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • https://www.romedia.gr/images/hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • https://www.romedia.gr/images/free-spins-coin-master-cheats_GM406889139.pdf
    • https://www.romedia.gr/images/coin-master-spin-hack-without-verification_GM406889139.pdf
    • https://www.romedia.gr/images/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • https://www.romedia.gr/images/coin-master-villages_GM406889139.pdf
    • https://www.romedia.gr/images/free-roblox-clothes-templates_GM431946152.pdf
    • https://www.romedia.gr/images/can-you-get-robux-for-free_GM431946152.pdf
    • https://www.romedia.gr/images/free-minecraft-texture-packs-java_GM479516143.pdf
    • https://www.romedia.gr/images/hack-coin-master-dzooka_GM406889139.pdf
    • https://www.romedia.gr/images/coin-master-hack-that-actually-works_GM406889139.pdf
    • https://www.romedia.gr/images/download-coin-master-hack-apk_GM406889139.pdf
    • https://www.romedia.gr/images/get-free-robux_GM431946152.pdf
    • https://www.romedia.gr/images/how-to-get-robux-easy_GM431946152.pdf
    • https://www.romedia.gr/images/free-spins-coin-master-no-human-verification_GM406889139.pdf
    • https://www.romedia.gr/images/microsoft-bing-free-robux_GM431946152.pdf
    • https://www.romedia.gr/images/free-robux-with-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045b3.bin
4a1783efed11fa3abfd40609400f456f7dc1d82463694ab92fda717e928f9146
pdf-font-stream PDF embedded font (sfnt) at offset 0x45B3 25104 bytes
font_01_sfnt_off00007f97.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 5696 bytes
font_02_sfnt_off00008ca9.bin
40a15a9049e9412bdd5c9a35f1903570ad5947e976b8939b833c9d7797e77bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA9 18260 bytes