Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c72c55a401ebce…

MALICIOUS

PDF

34.9 KB Created: 2021-06-25 06:25:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a4f0d40aa9f1f10488b034680d097eb0 SHA-1: bfb3e688c44c144c559ff2186ea4f47a6abc591b SHA-256: 38c72c55a401ebce17342d7842850bf0d77c9cbd65303519e5d2a22b071d6191
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, linking to known malicious redirector infrastructure. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. While no scripts were extracted, the PDF's structure and embedded links 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/hacker-egg-roblox-2021-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-roblox-tickets_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/pubg-uc-apk_GM1330123889.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-for-free-online-no-download_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-rc7-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-can-i-get-free-robux-super-easy_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-apps-that-work_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_off00002fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD4 22896 bytes
SHA-256: 8b3c879e0324de78a2fe8a2fd2e58bc10e545a881a0a7e5c6266d2a935d32fe9
font_01_sfnt_off0000632d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 19056 bytes
SHA-256: fc7a543e3af2f795de259fe29bc6c00405016841fb4cc8c26c8044ffee27c7d8

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