Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79704ba2a1d81e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 02:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8f9cc15ff96fd2b845324b5ffdcc5f2 SHA-1: a7177d292e3ffa65c800583052032d053e51b1d5 SHA-256: da79704ba2a1d81e9e4eeb3d3ddff5a7ec5c61ba6de36d3610c20e97b32579ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to phishing sites or malware downloads. The document also hosts a large number of links to other PDFs on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. No scripts were extracted from this sample, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent.

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=ny+i+norge+arbeidsbok+pdf+download
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/gajinulimuvenizogino.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/lebeninaraje.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/hipaa_guidelines_2018.pdf
    • https://static.usrfiles.com/ugd/b8c837_c67ac548abd5477f94ec77f1fc2067fa.pdf
    • https://static.usrfiles.com/ugd/61804c_5812844e5c6f41559bcc358c53060362.pdf
    • https://static.usrfiles.com/ugd/5899d5_6c952da458be4574a7fef2c8b655621a.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_2f5680a2844341169b018955155bde3d.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/sokuzitoridofetolifef.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/employment_equity_committee_member_appointment_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0457/7689/6156/files/76384932491.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0444/3042/6278/files/nice_guidelines_interstitial_lung_disease.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/dabesowininapaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/78895858231.pdf
    • https://cdn.shopify.com/s/files/1/0432/3619/6507/files/arthur_c_clarke_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/gixobuzanulegomakawep.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006487.bin
7aa95078727c686d5f96a10d7cd7d4e4724222118ec5f4c3b5857f24edbb669b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6487 5576 bytes
font_01_sfnt_off000077a4.bin
fee71491cb9420b338cda3959ecd569e7d606d3b0e5e7bdc1e8e421e7b0bf45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 10308 bytes

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