Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b5af01d9ab4414…

MALICIOUS

PDF

36.0 KB Created: 2021-06-29 23:00:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 493d4a1f0028aeb9c1d1d0eb6eceabc8 SHA-1: b34258cd863f9081a2ad9b00c866d9cec6fccfbd SHA-256: 38b5af01d9ab441407b70bd4ca4467c9cdc52b0badb7c41f0b02b2a4fb0f7309
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector at http://netcdn.co/app/431946152/how-to-get-400-robux-for-free-2021-game-hack. The document body and heuristics indicate a lure for free in-game currency or hacks, designed to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or scam attempt.

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.co/app/431946152/how-to-get-400-robux-for-free-2021-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-highschool-free-money_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-cool-marshmello-shirts_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-surf-leaderboard-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-only-pc_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-accounts-with-cheat-engine-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_off0000332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x332D 22796 bytes
SHA-256: 988da5a12af643ab77a38d908791b889c13aeae19d38b252f4f1c7de6aef6832
font_01_sfnt_off0000666e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666E 19448 bytes
SHA-256: 51e4234613b2dc392916bd526b83feb4aa0c6d17008f64bb7a44547adb00c428

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