Malicious PDF — malware analysis report

Static analysis result for SHA-256 a682525f049c4a19…

MALICIOUS

PDF

45.2 KB Created: 2021-05-15 09:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d31fce270c6eef9f7d861c1d0938af74 SHA-1: a086de412e5a770f04450c73fd7670550631d309 SHA-256: a682525f049c4a19259fee0c55afa25bacdc157d86cbdac03824b193d59f68a2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to other PDF files hosted on `bolandergroup.com`. The presence of a "download button" heuristic and the ML classifier's high confidence score suggest malicious intent. The primary URL `https://netcdn.xyz/app/406889139/coin-master-facebook-hack-game-hack` also indicates a lure for potentially unwanted content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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/406889139/coin-master-facebook-hack-game-hack PDF link annotation
    • http://bolandergroup.com/images/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/robux-prices_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004839.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4839 26540 bytes
SHA-256: 064e3142cb26dfda23a6ba7b64c89aeb86897bb97993686523a2be1b709c168e
font_01_sfnt_off00008564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8564 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F16 18040 bytes
SHA-256: 061f1859a06f64f15b62312cec33f4d1ae20d2ec323f296e754baff4e0335bc5

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