Malicious PDF — malware analysis report

Static analysis result for SHA-256 137f75c16329d7b5…

MALICIOUS

PDF

44.2 KB Created: 2021-04-23 13:36:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 765677c8e69b31219a72e039359c9049 SHA-1: 61e61d6f69946f8b35349a3831a125ff7dc6446c SHA-256: 137f75c16329d7b5f83ab145c4904142dfe1cdf0a9c57ee7c8623e210950f8b4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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://netsecure.top/app/431946152/comment-hacker-un-conte-roblox-game-hack PDF link annotation
    • https://www.ukrtrans.biz/images/aimbot-hack-roblox-script.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/roblox-do-you-want-free-robux-ad.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/how-to-make-your-roblox-shirt-free.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/free-roblox-combos.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/how-to-make-your-game-really-popular-hack-on-roblox.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/roblox-robux-genetator-hack.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/earn-free-robux-doing-tasks.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/free-live-giveaway-roblox.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/how-to-change-a-name-in-roblox-for-free-2021.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/free-cmds-in-roblox.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_off0000411e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x411E 27728 bytes
SHA-256: dadd54a436a7f665e719884d87dfcb5b4beb22bb267358f0b3d39933c73d4ed6
font_01_sfnt_off00007fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC5 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8976 18732 bytes
SHA-256: 2166c7aef55b232f549f9d37d093a164cb278701f55a32c2b53acb80f673d828

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