Malicious PDF — malware analysis report

Static analysis result for SHA-256 105aa8a7f4caa6e7…

MALICIOUS

PDF

33.8 KB Created: 2020-08-30 00:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dfa61404f424bc4c036b61dba41ea27 SHA-1: c52442b84b99694c521fb8c45d1a166ce64ac00f SHA-256: 105aa8a7f4caa6e7041d7f2de8e131e5c7ef069dc7e838cb99ddb531a654af99
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDF files, a technique often used for SEO poisoning or to mask malicious activity. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=a+speaker%2527s+guidebook+text+and+reference+6th+edition'. The document body, though heavily obfuscated, contains references to the same URL and other Shopify links, suggesting a coordinated effort to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=a+speaker%2527s+guidebook+text+and+reference+6th+edition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/49817467111.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6886/files/complications_of_malaria_in_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/rodipugozaganemunabavele.pdf
    • https://cdn.shopify.com/s/files/1/0467/7491/1129/files/feman.pdf
    • https://cdn.shopify.com/s/files/1/0433/1733/0075/files/99728328039.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/17156812683.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/vabirunob.pdf
    • https://cdn.shopify.com/s/files/1/0437/8204/5858/files/leletiwafakisukined.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/antisera_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/crossover_symmetry_iron_scap_workout_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/2139/3320/files/abc_tv_program_guide_sydney.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/18536279048.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/kelonaxufifozif.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_off000046f9.bin
368697fb8fecb4839c87e910dffc3f9854fd4c759b6839369fd54680bab614dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46F9 5836 bytes
font_01_sfnt_off00005ad5.bin
a62faa68b3fb11b8f4180fc9d13882c033f5ca9766e1c28a713de53ef15a37f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD5 9380 bytes

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