Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda7d5c563d1e7c6…

MALICIOUS

PDF

48.5 KB Created: 2021-06-09 04:41:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d840bf72752c0b265481e5c8c04efdbd SHA-1: f68804430fe1cb9badfd60886c10ef1208158cb6 SHA-256: cda7d5c563d1e7c6cc00f50a6c0f610e56b70ab6bb24330f78651ff51543dec2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links that redirect to a known malicious domain, masquerading as a 'free Robux generator' or 'game hack'. The heuristic firings and the presence of a call-to-action button lure reinforce the phishing nature of this document. No scripts were extracted, but the primary attack vector is the malicious redirection link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-robux-catalog-game-hack In PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/pubg-uc-or-pc_GM1330123889.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5120 24928 bytes
SHA-256: ce702cfd1e34cce236f8fb742c81db918eefb4dbc7a0b0a4ef6e1892450c38b1
font_01_sfnt_off000089fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FB 4712 bytes
SHA-256: 88f7d99cf5b8d6876941368ab5c27ffc0439cf2e4827d5d6d69055d2a2371207
font_02_sfnt_off00009991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9991 18708 bytes
SHA-256: 28bd889c38eaf0d156e183f8cde1956dd4fb62373f8dd44e61344771398cd56b

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