Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f43e9f83991f007…

MALICIOUS

PDF

29.4 KB Created: 2021-06-27 21:06:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c6e1d1b361defcd9436f8ba13a31e240 SHA-1: 9d069c6256ff18b20ad52faeede7efea4e3c6cc3 SHA-256: 4f43e9f83991f00763cf47ebbad0db40a51d1d4e0b2ad483a627ee6488252950
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a visual lure designed to trick users into believing they can obtain free Robux or game hacks. The primary link, http://netcdn.co/app/431946152/free-robux-generator-no-human-verification-no-survey-2021-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a social engineering tactic to drive users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4188

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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
  • 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 http://netcdn.co/app/431946152/free-robux-generator-no-human-verification-no-survey-2021-game-hack In PDF document text
    • http://www.sscs-uae.com/userfiles/files/free-things-roblox_GM431946152.pdfIn PDF document text
    • http://www.sscs-uae.com/userfiles/files/aimbot-download-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.sscs-uae.com/userfiles/files/cheat-codes-little-mix-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.sscs-uae.com/userfiles/files/how-to-make-a-costume-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sscs-uae.com/userfiles/files/robux-free-roblox-glitch-2021_GM431946152.pdfIn PDF document text
    • http://www.sscs-uae.com/userfiles/files/promo-codes-for-free-stuff-2021-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E20 21148 bytes
SHA-256: 815fb1fd7d4294cd650360ef70bf79ca5d387612416b9489c5531f9889eb1386
font_01_sfnt_off00004c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0D 20028 bytes
SHA-256: 7dedea29552996798b219831b869d3e8f8ae7d84fb0a99c65df6448efb5d0be5

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