Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d6df176c0b5094…

MALICIOUS

PDF

44.8 KB Created: 2020-08-11 13:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20903a123da24ac13e75fbc5f356be94 SHA-1: 998bc78c74553b6932b4f1e847586e5a1ba86fb6 SHA-256: 51d6df176c0b50941e73c53555bfe9c400a3fc96d961302d26d87efed9c636f2
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of embedded links pointing to a link farm hosted on Shopify. This suggests the document is designed to distribute malicious content or engage in SEO manipulation. The ML classifier strongly supports the malicious verdict.

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=believer+keyboard+notes+pdf
    • http://files.brooklynsewcial.com/uploads/1/3/1/3/131383514/230a8dbcc24c30.pdf
    • http://files.bluerockfurnishings.com/uploads/1/3/0/7/130740391/welijusekukugek.pdf
    • http://wosom.valhallavet.com/uploads/1/3/1/0/131069934/vemapu_wovamitazaretan_gituj.pdf
    • http://files.nwextremeoutfitters.com/uploads/1/3/0/7/130775668/c3b5e3f6b3ec541.pdf
    • http://files.aben4ace.org/uploads/1/3/1/6/131607029/9458139.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/boondocks_season_3_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/jspdf_autotable_columnstyles_width.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/believing_god_beth_moore.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/fekililebow.pdf
    • https://cdn.shopify.com/s/files/1/0433/2929/0390/files/50225402579.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/97718369412.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/45795628645.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/rojenepelom.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/xexetinizategefimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/on_board_air_compressor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/75465968600.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/xps_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.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_off000062da.bin
4aa3a28a985de09b7dbe2b9294742c098207a906e71bfcc5adca1baaa91d2184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 5448 bytes
font_01_sfnt_off00007576.bin
65300ee5c124cc54c39e1917f1adef315fb8ec234dcedaef846f32f642478a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7576 15696 bytes

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