Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53bc0eaf2e50e97…

MALICIOUS

PDF

35.5 KB Created: 2021-07-09 17:42:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2859da7251e9085a960c0d905d5fa221 SHA-1: 6a80e6c3e4e4542939e13368062adc2dd24ae1f7 SHA-256: e53bc0eaf2e50e97f7cfffba51f0f162919425d83c47d9e84c3ad632ce197d51
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/robux-hack-no-survey-mobile-game-hack. The document body and heuristics indicate a lure for a "Robux Hack" or similar game-related cheat, which is a common social engineering tactic to trick users into visiting malicious sites. No scripts were extracted, but the embedded links are the primary vector for the attack.

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/robux-hack-no-survey-mobile-game-hack In PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-plates-of-fate-hack-floating_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/pokemon-go-free-1km-buddy_GM1094591345.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/code-sur-free-boost-stands-anime-fighting-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-get-marshmallow-head-in-roblox-2021-fr-free_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/www-roblox-com-free-games-online_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-lumber-tycoon-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/hackear-roblox-cuenta_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-tix-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-com-free-stuff_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ombalicargo.com/new/public/ckfinder/userfiles/files/cheat-roblox-menu_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_off0000323b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323B 22548 bytes
SHA-256: 632dcd67da444255c22c9974f88ca09ff3b738c69767d17559cfffcd77e4ae15
font_01_sfnt_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 19404 bytes
SHA-256: d0793df6bba1e474d4284a27ffbc5caf249db6cfb23798e1a25e78b5c09884e6