Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd0e17506521275…

MALICIOUS

PDF

48.5 KB Created: 2020-08-08 22:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5518d888bc2800998de09c6924af1b3b SHA-1: 7d482c144a9301cb855457d14d4d3a734f8832c1 SHA-256: 5cd0e175065212754a4ec47827a85d77c443e71d7ec8ba34aae9247df917dae3
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 a redirector service designed to obscure the final destination. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms the intent to lead users to potentially harmful content. No scripts were extracted, and the document body is heavily obfuscated.

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=innovation+in+the+construction+industry+pdf
    • http://files.attain2gain.co.uk/uploads/1/3/1/6/131637219/fopenosibijate.pdf
    • http://files.octaskhoppers.com/uploads/1/3/1/6/131606502/9347302.pdf
    • http://xatinis.wolverine-restoration.com/uploads/1/3/1/1/131163635/4093176.pdf
    • http://files.veronicaperytphotography.com/uploads/1/3/1/3/131398473/nosufanemam.pdf
    • http://files.claudiariverotv.com/uploads/1/3/0/8/130873921/litor_fipopotopetol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/double_compression_cable_gland_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/luxibakibi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/85719426437.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/mideramodetolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7999/9383/files/65953329702.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/avery_template_18660.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/fidikike.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/64111725556.pdf
    • https://cdn.shopify.com/s/files/1/0432/6365/6099/files/49392373538.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1495/files/sita_bursary_applications_2020_academic_year.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/herbs_and_spices.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/tovugak.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_off0000803b.bin
15a9e9364b81e0aad041214f5408bfd2742133dd60282bdc734a0a2fd77098df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803B 5312 bytes
font_01_sfnt_off00009257.bin
f8c40f63e6400a1cbd80db615bb764abc024a352b7237d64d46bac46747e8ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9257 10152 bytes

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