Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72b82ce83190905…

MALICIOUS

PDF

48.8 KB Created: 2020-08-11 07:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ba17735a3ebb02d8e03d8e93b553fd3 SHA-1: 5c4a78a33912b53d315147a88a93b78349cca093 SHA-256: c72b82ce831909050be568ff78a0e73de28093b0737763bd1e45c01158671e75
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure through a link farm disguised as a PDF document.

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.com/pify?keyword=patogenesis+bronkiektasis+pdf
    • http://files.thechocolateopal.com/uploads/1/3/0/8/130813777/doxifune_mukela_dajenejidal_filapuwe.pdf
    • http://vekekeko.glennwoodhillsretreat.com/uploads/1/3/1/3/131382486/4996930.pdf
    • http://files.learningwithmisssano.com/uploads/1/3/0/9/130969960/1388b9889848587.pdf
    • http://jubaguvez.southernutahwaterpolo.com/uploads/1/3/1/3/131384635/8949516.pdf
    • http://files.yscenterforteaching.org/uploads/1/3/1/4/131437471/4ccac8597c.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/96053827754.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/jutugolixowalabazet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5882/2296/files/fesedakosoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/1072/7841/files/janerowikakolim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/6368140583.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/jibilijunesi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/letter_t_tracing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/2610/2947/files/22903760269.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/diganik.pdf
    • https://cdn.shopify.com/s/files/1/0440/8472/3864/files/85006926966.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/a_tout_le_monde_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/99873142542.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/wizubeta.pdf
    • https://cdn.shopify.com/s/files/1/0432/6945/6028/files/talelogefo.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/
    • https://cdn.shopify.com/s/files/1/0428/5969/2

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073f4.bin
bf36fc06fa16158155f7b6af34584ae9b5a824bd75546ae1f55d8bd13b63f80b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 5168 bytes
font_01_sfnt_off00008589.bin
4bb0ef7fbc101793d3b5c756efaa630eedf802d931e4301a669e7b6a1ab95bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8589 10140 bytes
font_02_sfnt_off0000a816.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA816 4324 bytes

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