Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac58f4d86dbf90c…

MALICIOUS

PDF

33.7 KB Created: 2020-08-08 10:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f8f3c062e28b9c9ec90c4370e67d9b0 SHA-1: 483f0d5b3dd71e07e552c12e7695f8522af90f13 SHA-256: 6ac58f4d86dbf90cd251c4f1ea30ac553d09f4573bd7b541f8230be93d3a7494
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=animal+sounds+download+pdf
    • http://files.saintjosephparish.org/uploads/1/3/2/7/132710784/078771bb1157b7c.pdf
    • http://files.duetoffers.com/uploads/1/3/1/1/131164546/gerumuma-xiredoga-fadosexa.pdf
    • http://files.seafaith.net/uploads/1/3/0/7/130775241/jamoroneda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1044/6744/files/bonfiglioli_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/cambios_sociales_en_el_adulto_mayor.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/54280509744.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/febiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/43542883306.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/60979132700.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/zifotebu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7137/files/nafopadinidubiresu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/sainik_school_lucknow_admission_form_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0443/8104/4902/files/apomixis_en_plantas.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/arrian_anabasis_of_alexander.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_off00004834.bin
cd5be505fc9badb28741cf4575ccbcb9c9d35d7e16972c17d6a04ef5a5c489e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4834 5172 bytes
font_01_sfnt_off000059cc.bin
29de102c9bfb895b6866459c4887fec9538127f362216d17f457cf06db10c07d
pdf-font-stream PDF embedded font (sfnt) at offset 0x59CC 9400 bytes