Malicious PDF — malware analysis report

Static analysis result for SHA-256 13567cb1d8083015…

MALICIOUS

PDF

37.6 KB Created: 2020-08-16 00:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e363c12aaeb395f97cba6e536d54fa6d SHA-1: 853269fccb1f12b8c999c99a2b494b01abd4ac59 SHA-256: 13567cb1d8083015b7fdd36cc5f872b590aa18dc25302bfcc85c8d0c0faa4a91
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 benign Shopify domains, but one critical link directs to a known malicious redirector. The document body is obfuscated and contains what appears to be a lure related to English exercises, likely to encourage clicks on the malicious link. No scripts were extracted, but the presence of a malicious redirector and the link farm heuristic strongly suggest an attempt to lead users to 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.ru/wb?keyword=numbers%20100%20to%201000%20in%20english%20exercises%20pdf
    • http://files.stephenwitkin.com/uploads/1/3/0/7/130775306/vavasefakobopu.pdf
    • http://ranugoji.greganchauffeurtoursireland.com/uploads/1/3/1/6/131606000/6976482.pdf
    • http://files.vegsense.net/uploads/1/3/1/4/131437376/rinulusojepibok-koxol-nunowavije-pagezosab.pdf
    • http://files.partyhousesupplies.com/uploads/1/3/2/8/132814949/15987a208b6c.pdf
    • http://files.northwestcampingresources.com/uploads/1/3/1/1/131164132/tivotijegikugasosuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/convoy_ambush_case_studies.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/weleselub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/sda_twi_hymnal.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/rexazabazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/soludoroj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/life_selector_credits_hack_download_2029.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/jinewiweloberirebit.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/58000933122.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.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_off00005387.bin
5c4b5f9cf30beda96d594473974b65d615e20b083f7e025a9efd802c1ac18895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5387 5732 bytes
font_01_sfnt_off000066e2.bin
43ef2c4e9a32b2b59aee9d753fc0d3b74d1569ccaa423c13aa15945bf22c9e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E2 10040 bytes

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