Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c80eb996f7c19…

MALICIOUS

PDF

41.6 KB Created: 2020-08-11 14:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da959994ec0dfb7b07db966264bf61f2 SHA-1: c3293d0e8d174f057b4b4bd79b5998297fc43023 SHA-256: 5b1c80eb996f7c19566e80d3c025c0359ea43c4901504192a954693601ca5bca
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, includes the same URL, suggesting a lure for users to click on it. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of directing users to potentially harmful sites.

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=coc+certificate+of+conformity+pdf
    • http://files.paperchasewholesale.com/uploads/1/3/2/7/132741029/wuwufexu.pdf
    • http://files.themobilityfactory.eu/uploads/1/3/1/4/131437676/rabubixi_lamazi.pdf
    • http://files.proficiencyfirst.com/uploads/1/3/1/3/131383544/047093.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7944/8216/files/kerowebokona.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/nox_insufficient_disk_space.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/also_sprach_zarathustra_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/21444694434.pdf
    • https://cdn.shopify.com/s/files/1/0436/2777/4115/files/45730992965.pdf
    • https://cdn.shopify.com/s/files/1/0429/6173/1743/files/ashraful_hidaya_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/attention_guitar_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/67405647345.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1976/files/52215373030.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/vozadiromejebefaxizujudeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0805/files/befusomapirupamizar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/futigizoxotatamirigopoj.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_off000065e4.bin
a5cde73573151d35701b718bd339c8602b036e35797705d5452fe44934dce1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5096 bytes
font_01_sfnt_off0000771a.bin
62995aebef483f6be1cc88b7e1a24d0294261d8dbebcf4733cf4af34ab0b84c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 9960 bytes

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