Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d8a6c20460c57…

MALICIOUS

PDF

52.0 KB Created: 2020-07-19 22:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c193c3ab0b28dfd619c0384a4ceef223 SHA-1: 77a2282ba55e236976b8e2f303019d6e3c6d2bc9 SHA-256: 7a9d8a6c20460c5736bb23a46f84c37e3f98daa161c298d315764f2fa3c1a3ad
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 of which point to external resources. One of these links, https://ttraff.ru/pify?keyword=consumption+function+macroeconomics+pdf, is identified as a known malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

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=consumption+function+macroeconomics+pdf
    • http://files.badlandsgymnastics.com/uploads/1/3/0/7/130739509/126676.pdf
    • http://files.campbellscostarica.com/uploads/1/3/1/4/131408369/34009.pdf
    • http://files.bscyouth.com/uploads/1/3/0/7/130739119/minovelikosejo-juwirujegexij.pdf
    • http://files.sultztonianinstitute.com/uploads/1/3/0/8/130874058/suzipunajifubu.pdf
    • http://files.margaretpolcawich.com/uploads/1/3/1/3/131382406/dadid_robasijamajak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://resudixam.files.wordpress.com/2020/07/fapodusa.pdf
    • https://wegopomipa.files.wordpress.com/2020/07/88807089038.pdf
    • https://xovexin.files.wordpress.com/2020/06/tixesutepagudolu.pdf
    • https://zijolaraf.files.wordpress.com/2020/07/62608466150.pdf
    • https://xanojebukeki525275366.files.wordpress.com/2020/06/51162845004.pdf
    • https://semukiko.files.wordpress.com/2020/06/jadakaluzafifo.pdf
    • https://wogeberej.files.wordpress.com/2020/07/78346955327.pdf
    • https://dofanadidam.files.wordpress.com/2020/06/nomukumun.pdf
    • https://tudenobinedu359522656.files.wordpress.com/2020/06/56581775496.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/77880210787.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/93532923565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/21471096668.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/mutagumesepopejibilil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/23948377056.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/wixeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/32700244022.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_off00008646.bin
8eb9aa7f8d9df4bd174018e7f597e0a98d1e63d659ce85b57e1d0b7efc522b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8646 5172 bytes
font_01_sfnt_off000097c1.bin
ad8bbaf3cf7ac10f0f1e9ad68625b6c1d4b9d4227ebc4b9bfafae9ab1c52c233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97C1 13224 bytes

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