Malicious PDF — malware analysis report

Static analysis result for SHA-256 142409aa4d2f7861…

MALICIOUS

PDF

51.0 KB Created: 2020-08-24 21:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 818519123a22030229116a231072dc05 SHA-1: 364c4931c141d7d28f82d6fcc7d78bf89615f9d5 SHA-256: 142409aa4d2f78617b88c0ccbfb6a72153d0e9cf6dbeb4e788965227943a5c9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that matches the primary malicious redirector. This suggests the document is part of a link farm designed to distribute malicious content.

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.ru/pify?keyword=list+of+magic+8+ball+answers
    • http://xufuw.ledlightstrading.com/uploads/1/3/0/8/130813478/b19b6295b762.pdf
    • http://woboti.salinakennelclub.com/uploads/1/3/0/8/130874388/zawokulura.pdf
    • http://xaxaf.aboveandbeyondfitnss.com/uploads/1/3/2/6/132681464/8631957.pdf
    • http://files.westlockpreschoolsociety.com/uploads/1/3/0/7/130738960/6903975.pdf
    • http://files.hhsmusicboosters.com/uploads/1/3/1/3/131384113/4153554.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/99102707218.pdf
    • https://cdn.shopify.com/s/files/1/0462/7221/7237/files/30550180508.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/32259069412.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/sebolareb.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/xurofurufafil.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/78444015176.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/jeginizagafuvuzelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/pegifov.pdf
    • https://cdn.shopify.com/s/files/1/0439/2130/9851/files/archibald_macleish_ars_poetica.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/vapipav.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_off00008941.bin
31bcb03f246e09063cff01d3e70c41e7777b6cab32c0da42850f965bb3d4e114
pdf-font-stream PDF embedded font (sfnt) at offset 0x8941 5568 bytes
font_01_sfnt_off00009c29.bin
38186085739ce7de6171ee486c3609cce0fcb114a0be198d505b10eb9a7699ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C29 10088 bytes