Malicious PDF — malware analysis report

Static analysis result for SHA-256 62743b1dab469adc…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 09:25:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e223171dec2ddc966f7328873f9a3134 SHA-1: 29e30f8013162f86c122673cbd26ccf4d4b1e1f4 SHA-256: 62743b1dab469adcc9301b7bb91e60c3ec4b72c42069822d69fae764bd9f739d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks' to lure victims. The primary redirector URL is http://netcdn.tw/app/431946152/roblox-promo-codes-free-robux-game-hack. This pattern suggests a phishing or scam campaign aiming to compromise user accounts or deliver further malware. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate malicious intent.

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/roblox-promo-codes-free-robux-game-hack In PDF document text
    • https://razredna-nastava.net/files/hack-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-cheat-to-the-end-of-any-roblox-obby_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/hackear-cuentas-de-roblox-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-500-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-use-cheat-engine-on-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/www-robux-us_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/all-66-free-items-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-human-verification-or-survey-2021_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_off00002d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4F 22916 bytes
SHA-256: 9e61361bf45f3b30677de95e8ce927479688bfdad2ef5e9d5a94f091d3d267e9
font_01_sfnt_off000060d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D1 19380 bytes
SHA-256: f599988ad614928277529a5070f43d57f30efd84bc389ab6e612c4c8b358aa39

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