Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbebf5139d89a9fe…

MALICIOUS

PDF

48.6 KB Created: 2021-06-08 22:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4c504af1d33ed4db933ca1fec80dbeda SHA-1: 2188d069fdfab84f1d2bfba6c0fefc04e6dfaa18 SHA-256: fbebf5139d89a9fe84111d0f1991f311cfa069b9896ba22e01f409e39ad5b9b9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links designed to lure users to external websites, masquerading as game hacks and freebies. These links point to known malicious redirector infrastructure, indicating a phishing or scam attempt. The document's structure and embedded links suggest it's part of a campaign to drive traffic to potentially malicious or ad-filled pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/hacking-clients-for-roblox-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/pubg-uc-daraz-bd_GM1330123889.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-comroblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-minecraft-java-edition-for-free_GM479516143.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
stream_004_off000052e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E8 25300 bytes
SHA-256: 3e50410c3c35b35c4dc811f1164a52e09e5e22af75591460bc3c3d04774c1d59
font_01_sfnt_off00008d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000099ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99AE 18860 bytes
SHA-256: 5e938e7c8986ac825ee100e077c98781a132191f04fe80101ec165084e9feb73

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