Malicious PDF — malware analysis report

Static analysis result for SHA-256 066038149414e8c4…

MALICIOUS

PDF

42.3 KB Created: 2020-08-04 00:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6458e1b21025fa52420105896324aab3 SHA-1: 79ee10f30f81d73dc7658318e08677e6c2b58b67 SHA-256: 066038149414e8c4e9dffa61ed5efbdb82d784f530c79bf60f08c4e47580df2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised with a seemingly innocuous keyword. The document body itself is heavily obfuscated but contains the malicious URL and numerous other links, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or redirection attack.

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=synonyms+worksheet+for+high+school+pdf
    • http://files.mar-pascual.com/uploads/1/3/2/6/132683328/vuwevasifupuva-jetozoxaja.pdf
    • http://files.vivafitnessshepperton.co.uk/uploads/1/3/0/7/130775934/zokatu.pdf
    • http://files.thrivewlb.com/uploads/1/3/2/3/132303337/lifizisukogonovax.pdf
    • http://fegoxe.dhammaforeveryone.com/uploads/1/3/1/8/131857419/nimos.pdf
    • http://files.intothewildlife.org/uploads/1/3/1/3/131379060/dotukoretam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/74797312814.pdf
    • https://cdn.shopify.com/s/files/1/0438/9984/6824/files/pewapabiwezekefuvisozavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/79006982037.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/engineering_materials_1_michael_f_ashby.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/naxukowozuwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/fatebenefupipanixebepa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/denadarupekawimuwakodi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/pitinekig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/17124859800.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/31699556914.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_off00006656.bin
2020426a8ea483a3bfbb3bcdc19c59708cadd1e24922f30db633087c280c7f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 5720 bytes
font_01_sfnt_off000079c6.bin
d8271db3e800d64c133e7e635dd3c6f60ace5851cbf3557dc40b6cff06da6744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 10220 bytes

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