Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24123a66b20f700…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 11:58:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ffd470e50d5b0e3e3bd58ab63c684dd2 SHA-1: 48ccf97a25268b3ef3ef5229c13f9150a88a8502 SHA-256: e24123a66b20f700bf698b1ca3e306aae8fb3bc68450eaba3d8bb90ef40e7a16
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a 'game hack' lure. The document body and embedded URLs suggest a social engineering attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure indicate a malicious intent to redirect users to malicious infrastructure.

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/406889139/coin-master-heaven-links-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-load-cheat-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-tiktok-coins-2021_GM835599320.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-cheat-engine-bypass-july-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-lua-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-candy-roblox-decal_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-do-have-a-speed-hack-in-robux-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-para-ser-bc-en-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-pin-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-btools-hack-2021-unpatchable-working_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
stream_002_off0000315f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315F 22160 bytes
SHA-256: 90cf734762c375508e3bb9feb88f20c661102867380e224e8254e9ad3f07211e
font_01_sfnt_off00006250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 18120 bytes
SHA-256: 74627921072acfa0c03477701ebe3f80c8d36b11fd50d34d5097d83f47cda2ac

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