Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffda2c3b4997a19…

MALICIOUS

PDF

43.6 KB Created: 2021-04-22 20:51:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad55b0a8b30773893fb4f39076399a15 SHA-1: 78304e7ab564b36c1a48d931a4c67855252853a6 SHA-256: fffda2c3b4997a19ca703c5df4eb271de8380d169666ecbaf9af7cb55daa6c21
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.pro/app/431946152/izuku-midoriya-roblox-free-schop-game-hack PDF link annotation
    • http://blueduna.com/images/brick-rewards-free-robux.pdfIn PDF document text
    • http://blueduna.com/images/free-candy-roblox-decal.pdfIn PDF document text
    • http://blueduna.com/images/free-robux-xyz.pdfIn PDF document text
    • http://blueduna.com/images/free-robux-now-2021.pdfIn PDF document text
    • http://blueduna.com/images/roblox-creepy-april-foools-hack-face.pdfIn PDF document text
    • http://blueduna.com/images/delta-roblox-hacks.pdfIn PDF document text
    • http://blueduna.com/images/free-roblox-download-no-admind-password.pdfIn PDF document text
    • http://blueduna.com/images/hack-denisdaily-on-roblox.pdfIn PDF document text
    • http://blueduna.com/images/win-free-items-in-roblox.pdfIn PDF document text
    • http://blueduna.com/images/survivor-hack-scrip-t-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_off00004163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4163 25028 bytes
SHA-256: 2c6cba8067f3e785780599a82985134cc01215bf64d097794d807970544cd096
font_01_sfnt_off00007b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000084d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D6 19580 bytes
SHA-256: 972c948b3853ff8bc6e7b079670abdb2cbd8060ad0c70723e273b26db54532e7

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