Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f81253b9690e5c9…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 18:06:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0eb2a542087516eac5762af8f79e572b SHA-1: 1247612dc3e21ad6c5670dbfa346a2823ffdd75f SHA-256: 8f81253b9690e5c9f03071b668b0997fa486b4c4195475228622d5d8dacd637a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) 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 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.tw/app/431946152/roblox-free-followers-game-hack PDF link annotation
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-avatar-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/hacked-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-t-shirt-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/quick-robux-hacks_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/click-this-button-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/hack-amievenalive-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/albertsstuff-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone-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_off0000313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313D 21964 bytes
SHA-256: 60730788283cdf25e0890fd5b183b0b8dd7e5497fd2d3ba865f621020b3f366b
font_01_sfnt_off000061cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 18812 bytes
SHA-256: dc9bf45809a21e5382c525c50e290b17f7eee9daad7f3bff19b6beee526fce4f

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