Malicious PDF — malware analysis report

Static analysis result for SHA-256 705e298ed1faac9c…

MALICIOUS

PDF

42.3 KB Created: 2020-08-19 14:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f86df17926f15c95eb43396f4b3ef416 SHA-1: a790745812e8c557c52c29cb044a9e6f4978ae26 SHA-256: 705e298ed1faac9ceae23e970ce4a139279aa8316d672cc61fb967432238147f
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 PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to direct users to harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself suggests an attempt to leverage these links for malicious purposes, likely related to phishing or malware distribution.

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/pify?keyword=cherub+free+form+tour
    • http://files.fellowshipchapel.net/uploads/1/3/1/1/131164079/59fcbef.pdf
    • http://files.willmarccs.com/uploads/1/3/0/7/130739621/7618743.pdf
    • http://dijotosa.bohemianbrowngurl.com/uploads/1/3/1/3/131383332/5922ab7fbe9.pdf
    • http://derera.themanicuredyogini.com/uploads/1/3/1/6/131637459/mixemawu.pdf
    • http://jasej.bungendorepreschool.com/uploads/1/3/1/1/131164250/488330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/time_limit_for_reporting_accident_at_work.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/66752325436.pdf
    • https://cdn.shopify.com/s/files/1/0432/5199/0691/files/basic_engineering_circuit_analysis_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/2951/1835/files/89063737172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/declaration_of_assets_and_liabilities_format_in.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6876/files/vojerososalepiwazagile.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/bedetemawikarogumurak.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/93895963585.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/economist_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0434/4594/4481/files/auriculoterapia_gratis.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_off00006b20.bin
fc383f48234d02c6c34c2850cc8bcec91a9babf3d0e891cd60539cd52a4d29c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 4632 bytes
font_01_sfnt_off00007ab9.bin
023ea47114686953a3de781eb3f5bc31a2dbc13f06fe075123c6b04cf65c7e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB9 9932 bytes

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