Malicious PDF — malware analysis report

Static analysis result for SHA-256 544a8805b0ef84f2…

MALICIOUS

PDF

41.1 KB Created: 2021-05-10 22:40:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2c017281c95e98664e64ef09e49b2a90 SHA-1: bf39a68127882a7a35d84aba7f79b298d4c592b0 SHA-256: 544a8805b0ef84f2bb0a624eb05b8b19c1c649acc991e0dea2f6c8ae92285e43
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF link farms. The primary lure appears to be related to "free spins" and "game hacks", with a specific mention of a "free generator" and a request for recovery secrets or private keys. The document's structure and content strongly suggest it is designed to redirect users to malicious sites, likely to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-spin-and-coin-links-game-hack PDF link annotation
    • http://iedarelief.us/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/roblox-re_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/get-robux-now_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://iedarelief.us/images/wurst-download_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://iedarelief.us/images/wurst_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/coin-master-heaven-daily-free-spins-and-coins-links_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_off000045d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45D3 25240 bytes
SHA-256: afe24e26f0599f3ec9bc3e78c6c82fce1260fbe98525257e6733373c3be4e426
font_01_sfnt_off00007f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F93 17896 bytes
SHA-256: 9e473fa370b66a6494b15977b9d2a3ea7c01ddc9c3166ab955b90e57f7a3e83c

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