Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bac4bbc5d2f6375…

MALICIOUS

PDF

55.5 KB Created: 2020-07-31 04:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 455e58c76ce5a5a867fe22d4a639e3c7 SHA-1: 9204a5f0c037c6913466560c5706b65c91245f88 SHA-256: 6bac4bbc5d2f6375318ec7b75920ff982b9d6f9150bd825ea25de0d59fee44d3
154 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, a common tactic for SEO poisoning or redirecting users to malicious sites. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=corynebacterium+diphtheriae+pdf', is identified as known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous links and the malicious redirector strongly suggests an attempt to lure users to harmful content, likely via spearphishing.

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=corynebacterium+diphtheriae+pdf
    • http://files.toniaindigohughes.com/uploads/1/3/1/3/131380342/negitonomovevuv-vexizi-vejamovixek.pdf
    • http://files.thepatchworkunderground.com/uploads/1/3/1/8/131857305/kizevagiluvifolema.pdf
    • http://files.tbabcockhoney.com/uploads/1/3/1/1/131164063/3872413.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/vakawibefavojifobemupasoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0226/files/nubeterigib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/bowipubapibunetiluf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/49938222409.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/81581124885.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/63029240029.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/niwawosokunavevori.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/varupikedutefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/nulerotibef.pdf
    • https://cdn.shopify.com/s/files/1/0439/0102/6459/files/fupabapigalorivezejawivid.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/lobumodutamilifisabuzux.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/gipatekajamixebapuwonap.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_off00009b8c.bin
415c3daf75ef9a481e3fef477f9fa3762200e45a6edb98e60482d98793a0be78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8C 5332 bytes
font_01_sfnt_off0000ad80.bin
cd3c70ca7cfa34aac4ead9c3c210b176ff3e9537c4bcf2b8df2413dfc959c05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD80 10412 bytes

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