Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b05a87ac073f9a…

MALICIOUS

PDF

40.3 KB Created: 2020-08-10 13:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1913885847df8951488d10d2e523620d SHA-1: cd7e16f3479c1993c3423e72595119b388a88cef SHA-256: 89b05a87ac073f9a5c7e13ca44e4370e317aa7cb01f94506a51b53a01d163245
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.com/pify?keyword=low+back+pain+exercises+pdf+arthritis+uk', is flagged as a malicious redirector. This indicates the document is designed to lead users to malicious infrastructure under the guise of providing information.

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=low+back+pain+exercises+pdf+arthritis+uk In PDF document text
    • http://files.westerncanineacademy.ca/uploads/1/3/0/7/130775475/nitut-vadakurovopi.pdfIn PDF document text
    • http://fizurib.bossbabemarketing.net/uploads/1/3/1/8/131857315/gosim.pdfIn PDF document text
    • http://files.laurabee.com/uploads/1/3/1/3/131383747/donozifaxow-wiwim-davawitu-lasebenip.pdfIn PDF document text
    • http://files.wellnessforlongislandnurses.com/uploads/1/3/1/4/131406344/gikibulifepe-pagudizes-wisuxebudoxutiw-wesaneroximum.pdfIn PDF document text
    • http://files.daeodain.com/uploads/1/3/1/4/131482958/3a934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/janexovipokupadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/cours_d_orthographe_ce1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/zixoxemasoxika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/bojumujone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/problem_solving_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/95034978423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/vekekugitoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/boundaries_for_your_soul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4124/9690/files/turepobatodigefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/fufakeradeb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BC 5516 bytes
SHA-256: 6a5849a0ced4b7da9886200bd8c0ff7b806a667c0aedfced0365c80a14181b41
font_01_sfnt_off00007584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7584 8956 bytes
SHA-256: a9da32c76af2ada9d3f4465ba61235715b8ea2015ef2fe666bd8a2594e063858

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