Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b15bd170810b75d…

MALICIOUS

PDF

46.5 KB Created: 2020-08-27 20:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1145e6e2880b41c4a83d6b6e6ee68cb SHA-1: 67a4d6f1ea206e4e4ddec9e4a9528b10dd699769 SHA-256: 4b15bd170810b75d9d9425773fe0ebd24e79906b63be98e0cdd08fcf142866cd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including a malicious redirector at 'https://ttraff.cc/pify?keyword=mark+rippetoe+starting+strength+pdf'. This indicates a likely attempt to direct users to malicious websites, possibly for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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=mark+rippetoe+starting+strength+pdf
    • http://files.crosstowncharityweek.org/uploads/1/3/1/4/131454523/vusonupepi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/5614181338.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/seamless_pipe_weight_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3101/files/zaxuloretofizim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/fleet_vehicle_inspection_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/75206849766.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/20859607141.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2503/files/metabolism_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/kiruzoradufixixigerorax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/18489949753.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_off000077f3.bin
ba7ca80bf149b74e62fb76af1b530582bc988b6c34b582d6e1927302434ec063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 5340 bytes
font_01_sfnt_off00008a21.bin
1fa0064e5caa36da6565329456943e906a7929b2041ce6bd8082e6c356ce89db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A21 10376 bytes

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