Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae917eb02781825…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 21:07:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c143a2ab20b4753968c8728acd46af1b SHA-1: 2ab62dd0ec2e352df5c86e5b748d90e5849d7fbb SHA-256: fae917eb02781825d30bfbe77b8e30c4fc3d17c70fdbf631495acac325360f39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to known redirectors and potentially malicious domains indicates a phishing or scam attempt. No scripts were extracted, but the document's primary function appears to be directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/free-robux-microsoft-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-growbuxnet_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robuxs-by-bananaman2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-real_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_off00002cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC5 21920 bytes
SHA-256: 59dd91d48471703a221c8a1c4a524360162e09ccd8e4f90e5936cc1a218e3b62
font_01_sfnt_off00005d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D21 19136 bytes
SHA-256: 6405807597aca73567740711097b1a0abf87aa815f4236fbfdcb073f0355892d

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