Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e8d5b29edaff9…

MALICIOUS

PDF

44.6 KB Created: 2020-08-25 10:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55b82a9be9e91a673925cd564b77564 SHA-1: ede6effed3d26d1b836ba3cbe777d1e3789e8001 SHA-256: 5a4e8d5b29edaff98f2425231f2882b663b4e9354cac985bc1791d7e76e9769e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. This suggests the PDF is intended to drive traffic to malicious sites, likely for phishing or malware distribution.

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.com/pify?keyword=best+video+recorder+app+android
    • http://files.beveridgeps.vic.edu.au/uploads/1/3/0/9/130969403/e3507616cbf4.pdf
    • http://files.wendellmillspiano.com/uploads/1/3/2/6/132695932/a3dcd.pdf
    • http://files.abbypartyrental.com/uploads/1/3/1/6/131637953/kisakiwejufukiporid.pdf
    • http://befilexep.difonet.com/uploads/1/3/0/7/130739415/7742683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/82978649028.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/65595445094.pdf
    • https://cdn.shopify.com/s/files/1/0450/9813/9813/files/boris_godunov_play.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/40179791734.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/bose_s1_pro_specs.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/afrocentrism_definition.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_off000070cf.bin
3d704fbed7c85d65f71b29868a13be2a370f198044c0f5c19bf5f39ae4092e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 5144 bytes
font_01_sfnt_off0000825f.bin
30efa0497c286af090af637effd1c973174ed82afde45e88d4b5d15a268cbb5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 10284 bytes

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