Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eef8211b6dfc5e…

MALICIOUS

PDF

34.8 KB Created: 2020-09-17 11:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa05b0c4280aafe3b60f0985518435b7 SHA-1: eb6c8ad00d51bca3d3e33494717569a451f8a67a SHA-256: f4eef8211b6dfc5e62c9eae7a6ea92e1e7208a929bb07734efd067adf0a94504
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a high density of external links, many pointing to a redirector. The primary malicious URL identified is https://ttraff.link/wix?keyword=brooks+fiber+properties+of+texas+irving+tx, which is likely used to lure victims. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on Shopify, suggesting a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.link/wix?keyword=brooks+fiber+properties+of+texas+irving+tx
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/90799582123.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9320/files/android_screenshot_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0459/9401/6935/files/junghans_wall_clock_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/oracion_de_alabanzas_cristianas.pdf
    • https://68e8d332-b620-4105-94b7-4a04dc7e68e3.filesusr.com/ugd/ab63e3_f42180e61b3c42b7bd15990756731322.pdf?index=true
    • https://0dcb0ad8-6d3d-43cf-acab-86718db7cda5.filesusr.com/ugd/38eac1_cfbdebe128e442288cf735920359aa43.pdf?index=true
    • https://8b0f27cf-70ab-4158-afc5-4e2f172616aa.filesusr.com/ugd/7fedcf_7463bb5fded741f5b9c6f2c8c37720a6.pdf?index=true
    • https://41509e0d-7765-4218-b3f7-183e0f31dad9.filesusr.com/ugd/01bc73_d3184492af194162bcb8b704c7ad4de4.pdf?index=true
    • https://253cc8ae-cd0d-4d9d-8c15-c3d67976beb8.filesusr.com/ugd/f51585_d6ed9c1b57574daa832c4400ba198d2f.pdf?index=true
    • https://461ef849-1d4e-478b-a301-a28f4d9e13ca.filesusr.com/ugd/c33cdb_fcf74f9e9bb84ab6b78c68db9e6dff01.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/country_song_about_pittsburgh_steelers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0203/files/academic_performance_of_students_with_hearing_impairment.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047d8.bin
616ec5b7fbc1efe5970a6a4f00b92bcfa71c6021d02aed9b242e0577cbdc3a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47D8 5420 bytes
font_01_sfnt_off00005a62.bin
04a911525ea34fee70526de046fb77c2b196794dd2a4e85f17d8458b607c0ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A62 10576 bytes

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