Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51f7d6356f127d6…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 18:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8dd5867d04b23b12c86a927ea5c3b766 SHA-1: da84b6f177fc1bca13a04d8068c9c8b94433f5b6 SHA-256: f51f7d6356f127d63dadc9010ee998ebd2efcd8456cd5db8096b1a035e40d7dc
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 Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=change+layout+background+color+android+programmatically In PDF document text
    • http://wupiru.vibertview.net/uploads/1/3/0/9/130969363/walamaraluzer.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/1/0435/3346/7807/files/linear_and_binary_search_in_data_structure_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4576/4770/files/bruxismo_botox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/rojogojuvumokexev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/kilojotofazas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/varenixupenepeletetituxij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0455/6242/9605/files/neopost_franking_machine_is240_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/10704768176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/79783724084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/advanced_trauma_life_support_9th_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/papujuvixelozaxigagera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/xinulefanuginokibidip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/saudi_anti_bribery_law.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_off00005d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 5520 bytes
SHA-256: 761f2d1849aa220e6e9e21e9b7ee7d15d67176bf67447edf5c07428a9f206b93
font_01_sfnt_off0000700c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700C 15156 bytes
SHA-256: 87a4a16b0c6aa922734293ada71f96f1f5e0005f651c3c5e6bc87ddff1bee4ec

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