Malicious PDF — malware analysis report

Static analysis result for SHA-256 79429b2a3acedfe4…

MALICIOUS

PDF

47.2 KB Created: 2020-08-05 06:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7814621bf5085b5744952a1e5e970114 SHA-1: ed5306e1856cb5ea0426587ab8d5ccd038aadfaa SHA-256: 79429b2a3acedfe447dddcdf95b2ec334bc435bdbb1692a575adf2313ab62f86
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=risco+cardiovascular+framingham+pdf, suggesting a lure to trick users into clicking a link that likely leads to a malicious site. The presence of many Shopify-hosted PDF links indicates a link farm strategy to improve SEO and 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.com/pify?keyword=risco+cardiovascular+framingham+pdf
    • http://files.mudlarktheatre.com.au/uploads/1/3/0/7/130739662/vexuz.pdf
    • http://files.tunicahumanesociety.com/uploads/1/3/1/1/131164252/borugonixum-velogigofon.pdf
    • http://files.lafayetteschoolrestoration.com/uploads/1/3/1/3/131398357/nutuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/9580761829.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/lagepamepabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/nomalizomaruluxijenevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/xizifefekawuvulod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8825/files/magic_chef_countertop_ice_maker.pdf
    • https://cdn.shopify.com/s/files/1/0432/0739/3439/files/97217740331.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/arduino_mega_2560_starter_kit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/39437791602.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/forelozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/gimemusemodiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/76142011224.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646e.bin
e417befff40fd7fc2b5dd3d28faebf17bd1f7248ad833d256a26ddfe67d86a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 5320 bytes
font_01_sfnt_off00007651.bin
a94b6d16b168b05689da8f3ef3ce27bba2e5d1f83a28062ae2bf64164347a45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7651 14272 bytes
font_02_sfnt_off0000a1cd.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CD 4324 bytes

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