Malicious PDF — malware analysis report

Static analysis result for SHA-256 345a44f8ff3e84bb…

MALICIOUS

PDF

44.2 KB Created: 2021-05-12 15:00:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2aab34d18cb722a9ce205d10e12b95d8 SHA-1: 597eabbab97eb021e13067d427e0f63868556d4b SHA-256: 345a44f8ff3e84bbf9116cb338a36cc7e95b8a3b017eedba6549bd5e808a2d57
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/best-way-to-hack-coin-master-game-hack PDF link annotation
    • https://www.metal.hr/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/password-free-roblox-accounts_GM431946152.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_off00004be8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE8 27448 bytes
SHA-256: 0760267280f3ddc49995f509997dc145c22333c6957763bd6555952b32ea34e0
font_01_sfnt_off00008a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 18308 bytes
SHA-256: efd36867875b7c9e05accf83dcfb4edd17123817e8c4c99ad8b82f7777b7703f

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