Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7d9898cfa7c60c…

MALICIOUS

PDF

45.5 KB Created: 2020-08-13 22:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8575b9d9433921efcaf03ea25a3abd2 SHA-1: 94779be0f2a095062b55f4059c6ec987b38dba8e SHA-256: 2d7d9898cfa7c60ca5859cf5c3a08c09136d95cc81df3d02e4ce7cd94215a63a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector (https://ttraff.ru/pify?keyword=propiedades+de+los+metales+alcalinoterreos+pdf). The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a SEO poisoning or link farm attack. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links for malicious redirection or SEO manipulation.

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=propiedades+de+los+metales+alcalinoterreos+pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://niviruvi.murphyismyagent.com/uploads/1/3/0/9/130969448/binivazo.pdf
    • http://wetidom.warwickmixedhockey.com/uploads/1/3/2/6/132682156/sabevejarimag.pdf
    • http://files.langleycyberpatriot.org/uploads/1/3/2/6/132695851/teguvav.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/79795211630.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/80010190302.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/wetarepezuwusod.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/sugepewabepakemovovixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0436/0532/8034/files/rivibozede.pdf
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/minecraft_puzzle_maps.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0493/files/azar_basic_english_grammar_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/metso_gyratory_crusher.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7067/files/cocubes_aptitude_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/auditoria_informatica_de_explotacion.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57189589950.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4277/files/suxuk.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_off00006f99.bin
d8f529fe2f39af5c1cfa62d7f5efda8e3e575cbca651b4df0ff35ac2a1e109d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 5300 bytes
font_01_sfnt_off00008183.bin
9d0109350c34966cd8f3e4e7d806d69838abcaa809184d4ab8f369983569d529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8183 12128 bytes

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