Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a081296100499d…

MALICIOUS

PDF

39.6 KB Created: 2020-08-12 18:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 209971405e46690989438350d855d8a1 SHA-1: 8e44771572d465dbfb64966819d2f18ba503bf5d SHA-256: 84a081296100499d3b79a6c5395b5296a0c570a1aa0b762c573bd6e1ca75ec9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains, forming a link farm. One of the primary links, https://ttraff.ru/pify?keyword=hongo+metarhizium+anisopliae+pdf, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to lure users to malicious infrastructure.

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=hongo+metarhizium+anisopliae+pdf
    • http://files.annadjohnson.com/uploads/1/3/1/8/131856186/zevikusikakol.pdf
    • http://files.chroniclesofdestiny.com/uploads/1/3/0/8/130813643/0c69dc128b9c63e.pdf
    • http://files.aggressivehomeinspection.com/uploads/1/3/1/3/131382808/8761456.pdf
    • http://files.neilestrickgallery.com/uploads/1/3/1/3/131380847/posuzazorax_tivakewedatu_radegigafevok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0113/4754/files/36241221627.pdf
    • https://cdn.shopify.com/s/files/1/0430/7694/4033/files/pekum.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4041/files/43872317689.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/98253305700.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/adelerolling_in_the_deep_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/surah_ar_rahman_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/tanidofusepipij.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/disetotetuzawefedajuwoven.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/tasurelinejerit.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/72284492526.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/energias_renovables_introduccion.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_off00005e0c.bin
f01adbe4bd7e934efe8aca00d3a69d139305466842a7797afdbbe1cd50db347d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0C 5464 bytes
font_01_sfnt_off00007078.bin
00abe3c901fff60da584466b05565c41b59f9c24a0dbeb2b07a1a53842e9a390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7078 9712 bytes

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