Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f158634fbd6b10…

MALICIOUS

PDF

42.6 KB Created: 2020-08-17 01:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf993406b5669ed3f3226a7e1a3ac761 SHA-1: f5667793f3489119643fabde9dcd10d3f856fc9f SHA-256: c4f158634fbd6b107bd4c94ad3330cc328e7d91b2bbda6d5a45aaf7599e3854c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to lure the user to a compromised site for further exploitation.

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=aashiqui+3+song++songspk
    • http://povodaj.goalkeepersali.co/uploads/1/3/0/8/130874601/db779a.pdf
    • http://files.fedexreach.com/uploads/1/3/1/4/131407887/gefiponev-dufonizetifizer-magusubogupuv-gepixu.pdf
    • http://files.heavencanbefound.com/uploads/1/3/1/3/131384018/tizalunovemili.pdf
    • http://bowanix.brendamargriet.com/uploads/1/3/0/7/130775934/7703465.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/67801601195.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9915/files/the_psychology_book_big_ideas_simply_explained.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/passport_renewal_form_download_australia.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/design_research_in_architecture_an_overview.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/fuvanofozaterigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/devexpress_report_hide_subreport.pdf
    • https://cdn.shopify.com/s/files/1/0430/2723/4969/files/39049654480.pdf
    • https://cdn.shopify.com/s/files/1/0437/8958/2487/files/25469358823.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7031/files/l_aleph_borges_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/4257164923.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/zipaduwizuwapiwaruwiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/pasasatoniximi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/pexuke.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1181/files/tumuterixidofij.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_off000065be.bin
157202ac2f6d11d6c99e2aa3183b5ac7e041ec2fdf4ec81889833b359ecd80f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5296 bytes
font_01_sfnt_off000077be.bin
da238f386fd0f22835c5ba1560cabd2acb399d712481b544b3d15a4ecfd9fd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 11472 bytes

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