Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c105a7b09e623a5…

MALICIOUS

PDF

49.1 KB Created: 2020-09-22 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c588274fc57e8e96129354051ba47ddf SHA-1: a2786460ee35164c926c1f27729e3b2f95bd8297 SHA-256: 9c105a7b09e623a528f200112e2583605991db2f4f1055490146cd7c5d03a433
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=ver+1917+online+espa%25C3%25B1ol+latino+gratis In 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/1/0434/6668/6629/files/deviwifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2318/5566/files/14687356250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5645/5831/files/21685415660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5136/9127/files/13896744052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/vofitujexovemojulox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9440/3998/files/biotechnology_reports_impact.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/313075025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3780/0086/files/jeppesen_airway_manual_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0483/6258/files/cadet_uniform_girl_scouts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/72408474913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/jomofewijede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5649/5783/files/lezegoramubudoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/lukezadetuzimak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643B 5452 bytes
SHA-256: fe0b08ffd2b0621e766ab2c720ae09d98e7f2b25dfe1320898c02fb46b8b506e
font_01_sfnt_off000076a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A2 11668 bytes
SHA-256: f8dd8f8f01da5ea52a4fbe81d915ea74291df56350ad47cfadc20f83db4a449a
font_02_sfnt_off00009ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE5 16904 bytes
SHA-256: b66394b6fa7751ff45f3085cc3bde4847bf9d9a83d0d717e40bfeca0790707d5

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