Malicious PDF — malware analysis report

Static analysis result for SHA-256 647a59a239139fd1…

MALICIOUS

PDF

46.0 KB Created: 2021-05-11 19:50:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ae4e68a99acd4283a204d3b64c251fbd SHA-1: 7cd4455e453ffe24e5e13cd26cd9b96797a02de5 SHA-256: 647a59a239139fd18419e3cda82f0830e8cebbca78d099a358d44d9b1bb231a0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hack generators and free spin offers. The primary link directs to a URL associated with 'coin-master-hack'. The document's structure and content strongly suggest a phishing or malware distribution attempt, leveraging social engineering tactics to trick users into visiting potentially malicious websites. No scripts were extracted, but the PDF's link farm and lure content are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • 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/coin-master-hack-to-get-free-spins-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/master-hack-coin_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-pet-food-coin-master_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_off00004cc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC9 25524 bytes
SHA-256: c942c0c7d2d901741c1cf1a9eabf58bbf3cd9d88285ff9af10d54c1d34b4baa1
font_01_sfnt_off000086a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A2 3264 bytes
SHA-256: 2756f1aee481866e7be68ea9759d1a1529e56124c339b6d6ce98461e9bcfc10d
font_02_sfnt_off000091ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91ED 18056 bytes
SHA-256: 6ebf753f6e2aa75b7f89159318a8360a057196b850713683f584e5709dbcaa9a

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