Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c3731c480eeeca…

MALICIOUS

PDF

42.8 KB Created: 2021-05-17 09:25:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e6ebd51ea52935370e90e7eeb326db04 SHA-1: 02d9964270d6062f3cf2b270e6b1f97eb96705d1 SHA-256: d5c3731c480eeecac6022f301e2515d20a75003b11d405ddaa169bd25d3e4eff
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as game hacks and free currency generators, such as 'coin-master-daily-gift-free-spins-and-coins-link-today-game-hack'. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The presence of multiple SEO-optimized PDF links further suggests an effort to distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-daily-gift-free-spins-and-coins-link-today-game-hack In PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/robux-page_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.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_003_off00004a78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A78 25248 bytes
SHA-256: b5ff682525083dd3cc8729430ea0e6d2e88da50f5882d2c39a232647dea1af8b
font_01_sfnt_off000083d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D5 18652 bytes
SHA-256: acc88e8ff3d4d09cb66d664b97f6065b804d1ea0ab1b79688b3054775362f50f