Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a64ce2eeecc1ef3…

MALICIOUS

PDF

43.9 KB Created: 2021-05-16 18:35:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b522eda3038c855975e5962abce27b0f SHA-1: d7cdb863faec84c488d6da982a04bbe37fdb8eae SHA-256: 6a64ce2eeecc1ef3a01e69590e91de73bc05ecd2e40966a0be97bb6fad6f7b76
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, including a known malicious redirector at `https://netcdn.xyz/app/406889139/coin-master-free-spins-link-download-free-game-hack`. It also hosts a link farm of PDF files, many of which are SEO-optimized lures for game-related cheats and currency. The document body, though partially corrupted, contains similar lures and URLs, suggesting a phishing or scamming attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-free-spins-link-download-free-game-hack In PDF document text
    • http://firesafetyservices.biz/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-website_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-link_GM406889139.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_003_off00004541.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4541 24944 bytes
SHA-256: 7c57edca6d058c15c3e8e6042a581a8c79a5c36445edad59da485fb15a8b46e7
font_01_sfnt_off00007de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off000087f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F9 18636 bytes
SHA-256: e0ee4d28e9fbd90893640acb023fdb3433a7d18e360fd79b0a1965f7934d0c46

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