Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b031e2ce9f67678…

MALICIOUS

PDF

51.0 KB Created: 2021-05-19 12:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2589e2b8ce8315bbca3088132625f2de SHA-1: 144dc5f0e89d893a15dc64e9d978e3b5e99893a5 SHA-256: 2b031e2ce9f67678fb0fb50b066955bcdc2104c7d08d1a6a48617435660bf53a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The primary attack pattern involves tricking users into visiting these malicious sites, likely to deliver further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

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 https://netcdn.xyz/app/431946152/robuxy-com-free-robux-game-hack In PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/roblox-gang_GM431946152.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/how-to-get-a-free-pokemon-go-account_GM1094591345.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://thanhdatphatsolar.com/public/upload/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://collectrobuxIn 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_off00004b93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B93 35188 bytes
SHA-256: 6a07e93cb971f270ee7b6e3a70ac540f9b7f6bec6d3ab3be049a718f6da3a426
font_01_sfnt_off0000995d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x995D 3464 bytes
SHA-256: 0be0e72a804a2f465715303533d898e31f732649d41b4dd7886bfa972f7795a1
font_02_sfnt_off0000a4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4C2 18452 bytes
SHA-256: 502ad6067225007cfeab5155f8ca615546b56d7ab4478b734f537abd02c25d18

Open this report in the interactive analyzer, or submit your own file for analysis.