Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c7128c6c9a41fd…

MALICIOUS

PDF

44.8 KB Created: 2021-05-15 00:31:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fee4ea572da1d18eb88ca756b99042ce SHA-1: 534566d8331d745b5ea4b2793d180bdf25756bf6 SHA-256: a8c7128c6c9a41fdab4ca9768733c12f86b05503203d035236479cca1a4f145a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a "free generator / game hack" which redirects to known malicious infrastructure. The document body and embedded URLs suggest a scam aimed at tricking users into visiting malicious sites, likely for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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-2021-today-game-hack In PDF document text
    • https://www.metal.hr/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/robux-earning-sites_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/master-coin-free_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-18_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-roblox-hack_GM431946152.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_off0000486e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x486E 24664 bytes
SHA-256: 446782eff9ad908a594b71572492d9823a4dfca602afd8e14e21a328c6ec885c
font_01_sfnt_off000080df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DF 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC9 18812 bytes
SHA-256: 705c5903f824403b328e8e9dbd2ab52a650d097fc3c0d4bbd34be772086d041a