Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace23071c6a9dfad…

MALICIOUS

PDF

34.2 KB Created: 2021-05-23 06:09:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e7250dbffcf541fcc5f71265938e85ee SHA-1: 2ffef73851a79fe4019c557fcad206c6b28355c3 SHA-256: ace23071c6a9dfada6f6fe2d7830110c64a0630241b19e742e94b9e6a7290104
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, including one that is algorithmically generated and points to a PDF file hosted on a suspicious domain. The document body and heuristics suggest a lure for a 'free likes on TikTok' generator, which is a common social engineering tactic. The presence of a 'Download Button' heuristic further supports the malicious intent of directing users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

Heuristics 4

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/835599320/free-likes-on-tiktok-game-hack
    • http://brinicombe.co.uk/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://brinicombe.co.uk/images/free-robux-hack_GM431946152.pdf
    • http://brinicombe.co.uk/images/coin-master-free-spins-hacktman_GM406889139.pdf
    • http://brinicombe.co.uk/images/how-to-get-a-free-minecraft-server_GM479516143.pdf
    • http://brinicombe.co.uk/images/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003102.bin
b6f9cc22403b3786ceecbc70ae3bb99fcedbf378db80b9f8a1f145063f2feb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3102 23620 bytes
font_01_sfnt_off000066a3.bin
68a974c9aa3c870eecc965d525ccb957938ff5f02ba9183d05fa54c35671def6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 17456 bytes

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