Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1fad2687959d0f…

MALICIOUS

PDF

51.5 KB Created: 2020-08-31 15:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0863ed1ae06e0e2c5f04db0e28437750 SHA-1: ec8690a97bae4ff62947aa5b143b02ab1c5cd4fc SHA-256: 5b1fad2687959d0f59b355870083bd0b47f955a6fc9c0b173dbe7e1a914b45e2
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'crime reports'. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic shows it's part of a larger link farm. The embedded link directs to `https://ttraff.cc/wix?keyword=crime+reports+cheyenne+wy`, which is known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=crime+reports+cheyenne+wy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/7215/1703/files/james_watt_neyi_icat_etti.pdf
    • https://cdn.shopify.com/s/files/1/0437/5114/5626/files/couple_goals_video_status.pdf
    • https://cdn.shopify.com/s/files/1/0430/6550/8002/files/modelo_biopsicosocial_ventajas_y_desventajas.pdf
    • https://cdn.shopify.com/s/files/1/0448/4576/0669/files/wenexozo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3010/8581/files/apics_certification_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/circle_theorems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9319/files/xukosisazuwutobevobit.pdf
    • https://cdn.shopify.com/s/files/1/0455/3523/2165/files/85727204854.pdf
    • https://static.usrfiles.com/ugd/76b6de_64d716a5929c431ebcce4041424d8cb3.pdf
    • https://static.usrfiles.com/ugd/097bd5_a56d084d45ac4f898539e62da554d66a.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://static.usrfiles.com/ugd/f3cb45_e344d48b9a7e469ba48de19b72b756ab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/rejetuzejanuguf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/pukaripetib.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_off00008388.bin
109695c727b5747441e859c9602d4ceee5f75642fa36adbbe1d6307919fc3c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8388 5028 bytes
font_01_sfnt_off0000948f.bin
cbd981bbaafef7d1c8999b36036f0b7588fa8e663b70084d6cb317e0839f824a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x948F 14280 bytes

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