Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bced71ea588b5c4…

MALICIOUS

PDF

44.4 KB Created: 2021-05-17 04:35:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d507fb784d924c96d9520adb4f01dd75 SHA-1: eaec1e4e7f7bd434a00aec5cfe456151b181cee0 SHA-256: 0bced71ea588b5c48d61d5decc2ba162fb38e67530243b2e1fc3a1943e4f86e4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to external domains. The document body, though partially corrupted, suggests a lure related to 'hacking' or 'free rewards' for games like Roblox and Coin Master. The presence of a ML classifier flagging the PDF as malicious and the extensive link farm indicate a high likelihood of this document being used for SEO manipulation or to redirect users to potentially harmful content.

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/how-to-hack-roblox-game-hack
    • http://pisanie-nut.pl/images/coin-master-daily-rewards-link_GM406889139.pdf
    • http://pisanie-nut.pl/images/free-coin-master-spins-2021-link_GM406889139.pdf
    • http://pisanie-nut.pl/images/microsoft-rewards-roblox_GM431946152.pdf
    • http://pisanie-nut.pl/images/coin-master-hacks-no-surveys_GM406889139.pdf
    • http://pisanie-nut.pl/images/bux-free-robux_GM431946152.pdf
    • http://pisanie-nut.pl/images/coin-master-hacks-that-actually-work_GM406889139.pdf
    • http://pisanie-nut.pl/images/www-roblox-com-robux-free_GM431946152.pdf
    • http://pisanie-nut.pl/images/coin-master-gift-link_GM406889139.pdf
    • http://pisanie-nut.pl/images/rbx-land-free-robux_GM431946152.pdf
    • http://pisanie-nut.pl/images/how-to-get-free-chest-in-coin-master_GM406889139.pdf
    • http://pisanie-nut.pl/images/free-minecraft-realms-to-join_GM479516143.pdf
    • http://pisanie-nut.pl/images/coin-master-hack-apk-android-1_GM406889139.pdf
    • http://pisanie-nut.pl/images/free-robux-discord_GM431946152.pdf
    • http://pisanie-nut.pl/images/mathep_GM431946152.pdf
    • http://pisanie-nut.pl/images/how-do-i-get-free-robux_GM431946152.pdf
    • http://pisanie-nut.pl/images/free-minecraft-printables-food-labels_GM479516143.pdf
    • http://pisanie-nut.pl/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdf
    • http://pisanie-nut.pl/images/free-minecraft-maps_GM479516143.pdf
    • http://pisanie-nut.pl/images/coin-master-free-pet-food-links_GM406889139.pdf
    • http://pisanie-nut.pl/images/free-spin-generator-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047f9.bin
7fbb039eac8f37fdd2689437de8b37fd1599b9d55a63bb1fafcc54436c6675bd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F9 24552 bytes
font_01_sfnt_off00008077.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 2880 bytes
font_02_sfnt_off00008a61.bin
73440050ee62d9c8dc97d7cf0d13859b5ca63a66159f36279ab18a86d0bf293f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A61 18344 bytes