Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b25f99ff1e7c7a…

MALICIOUS

PDF

41.6 KB Created: 2021-04-26 19:09:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b80acd8e504d60c751ea7f3ffb26812 SHA-1: c75d8a0a64f9595c8c1255dbe1b7f49aed10f05b SHA-256: d7b25f99ff1e7c7a8072d5a0b14a3fe9d84e8478f1e1bdd7f72979a5181a6839
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs social engineering tactics, specifically a 'game hack' lure, to trick users into clicking malicious links. The document contains multiple URLs pointing to sites that promise free generators or hacks for games like Roblox, which is a common pretext for phishing or malware distribution. The presence of 'cmd.pdf' in the document text and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest an attempt to disguise malicious commands or links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/this-server-is-hacked-sound-id-roblox-game-hack PDF link annotation
    • https://www.ukrtrans.biz/images/free-robux-online-no-survey.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/hack-roblox-with-cmd.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/hacking-a-fans-roblox-account-projectsupreme.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/comment-hacker-un-conte-roblox.pdfIn macro / runtime command snippet
    • https://www.ukrtrans.biz/images/how-to-hack-robux-roblox.pdfIn macro / runtime command snippet
    • https://www.ukrtrans.biz/images/f-r-e-e-that-spells-free-roblox-id.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/how-do-you-hack-admin-on-roblox.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/how-to-hack-into-roblox-account-roblox.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/free-robux-gen.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/hacks-roblox-iceboss.pdfIn PDF document text
    • https://www.ukrtrans.biz/images/hacking-a-fans-robloIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000041cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41CF 27204 bytes
SHA-256: 6f0a5fafc6c7af734c338fffdd5d49923eff04bf8da95cce6fec1d7d44ce408a
font_01_sfnt_off00007f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F14 18896 bytes
SHA-256: 1ad813618cd352babf91455c7e7660c94a45cb393f6b409356ade54b2ff8a39f

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