Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed8b0c800bf78e0…

MALICIOUS

PDF

43.0 KB Created: 2020-07-19 02:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67a21c9173e3cf0caf98777ef8f329b SHA-1: 3d8627b6fa1502e917b9bb1aabd8174d9c1cb7c7 SHA-256: 8ed8b0c800bf78e0b5e0635c77547e78f1a0ca17ba456aeffbb0c697fc85a63a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to redirector infrastructure or potentially malicious content. The 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics indicate a deliberate attempt to obscure malicious destinations or engage in link farming. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially harmful websites.

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.cc/wb?keyword=long%20division%20with%20decimals%20worksheets%20grade%206
    • http://files.coffeetoglow.com/uploads/1/3/0/8/130814687/jobaseputodi.pdf
    • http://files.nutcharees.com/uploads/1/3/1/4/131410234/bibigeti.pdf
    • http://files.hampshiremanagement.net/uploads/1/3/1/3/131379716/602912.pdf
    • http://files.ourfrenchimpressions.com/uploads/1/3/0/7/130739037/5b906a2348.pdf
    • http://files.beautyofpraelia.com/uploads/1/3/2/6/132683367/5081063.pdf
    • http://files.dirtyharryserotics.com/uploads/1/3/1/0/131069819/8a5670.pdf
    • http://files.stuartwestwood.com/uploads/1/3/1/4/131407284/0d4e65.pdf
    • http://files.beauty
    • https://vavaxuxaber.files.wordpress.com/2020/06/xatopifeka.pdf
    • https://fapebera.files.wordpress.com/2020/07/22541081685.pdf
    • https://sajovuvinar.files.wordpress.com/2020/06/kisizosog.pdf
    • https://fadipitevak.files.wordpress.com/2020/07/79585152126.pdf
    • https://juzorikum.files.wordpress.com/2020/07/67972857110.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugomedimugatusigoxafif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/xagusexuduzezasuwomisizep.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/32847903543.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/numuxejopitedelem.pdf
    • https://cdn.shopify.com/s/files/1/0430/3241/2311/files/96806939317.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/58520501665.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a47.bin
781de7c3c3196c56741941b835dd8e5ef4c4c3923ca33ffb8ff50b7382de013b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A47 5452 bytes
font_01_sfnt_off00007cb5.bin
e7617c1f95fad9945fdb58950394397e3fd7223bdb482019cf51f10f9b8b0d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB5 9780 bytes

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