Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae7d56f2b993cd7…

MALICIOUS

PDF

38.8 KB Created: 2020-08-30 15:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeaa71007c8785f7bf663683533fd33f SHA-1: beeba6b8215410695d94f432404ef89125c9e35e SHA-256: 0ae7d56f2b993cd7d0ffd68451b74ceb12d65a716f8ac902516a46b9b251caa7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector URL known to host malicious content. The ML classifier also flagged this PDF with high confidence. The primary IOC is the redirector URL, which is likely used to funnel victims to further malicious sites or downloads.

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/wix?keyword=mathematical+analysis+by+malik+and+a
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_09ff9eee10534719a34530a46cfcff34.pdf
    • https://static.usrfiles.com/ugd/dc98cc_8d0a253d1ac644709f090bd03a614462.pdf
    • https://static.usrfiles.com/ugd/3aee12_faf472352012458a980bbef70b79cc4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fcfb1db18f843919c603408de94fb81.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb875fa3d1c47099af43c8358cca095.pdf
    • https://static.usrfiles.com/ugd/b52961_6a332405c4b343d08571d4a95f4a5c65.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fc6a2a97fce49a3912d7de5713a4def.pdf
    • https://static.usrfiles.com/ugd/f96b02_72c2a96a55b54ab6915cf3c2bb5a05a8.pdf
    • https://static.usrfiles.com/ugd/3ce946_dbdd1a7c2269461a8469015be3284758.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62ce61e7b49492f9187ab3132f7c316.pdf
    • https://static.usrfiles.com/ugd/4b7290_41280493a57b42c2b994baaf51b5956c.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_e8a32393e94d4a3d9dc49ea9ce0543b2.pdf
    • https://static.usrfiles.com/ugd/c7a620_83a9031b96da4cde9c283ac013af978d.pdf
    • https://static.usrfiles.com/ugd/b8c837_808dcbcd55bd42d580d2a6857c57554a.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/bash_profile_mac_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/5415/3371/files/3855073973.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/38998981283.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/winofu.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_off000059c6.bin
8afacdede191d7626f6c69edaffa6d2a049ea37c4dda753fc75bc56bd3381006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C6 5396 bytes
font_01_sfnt_off00006c00.bin
b767885ab7c9add2b710b8183a8886ef7f15fbf94f7a47aa850ce28de1bb525f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 10060 bytes

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