Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdef2640d4fdcf3…

MALICIOUS

PDF

43.8 KB Created: 2020-08-01 11:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b3d532c046d4f67b152daf35e788863 SHA-1: 5e5e0f4b7d866d5d3bf0972aa6420ae70304ff86 SHA-256: 6fdef2640d4fdcf3cf7855f8bbc22e0c56d6f054e1016348fe67e18ccecb9d45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.com/pify?keyword=mozart+clarinet+concerto+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the malicious URL and other benign-looking URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=mozart+clarinet+concerto+pdf
    • http://files.stonecutterswsq.com/uploads/1/3/1/4/131406222/377363.pdf
    • http://files.bestconcordiapodcast.com/uploads/1/3/0/7/130776573/1152967.pdf
    • http://files.kpscritters.com/uploads/1/3/1/3/131379039/6885408.pdf
    • http://files.victoriavisions.com/uploads/1/3/0/9/130969918/1709199.pdf
    • http://files.bottineaubaseball.com/uploads/1/3/1/4/131452938/ronelexobefule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/vobofizipimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/20281398859.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/navojawilozepakitoneta.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/sufunowexuruvamobidugis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/jiregegutanumiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/49348304440.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/16712128019.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3763/files/65678407524.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/pinolanuzemigik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/tazasabumevukuzijinunabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/mikazaguzenogazamitoj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e67.bin
534cc0532571e141a8eacf1e01dbb008b1004770a26a6bf7085e894ae9884df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E67 5028 bytes
font_01_sfnt_off00007faa.bin
4288a8f18c2ad33f7878b52c4ec80beddf0accede57913bb95cc85c65242fb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAA 10188 bytes

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