Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f2faf65097a52…

MALICIOUS

PDF

54.4 KB Created: 2020-07-28 19:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3652247d573929bff732513a9b900a45 SHA-1: 6a16f8c022b1e3e3500b5f554046f413203d9619 SHA-256: e20f2faf65097a52aae242013c582e8676a88e1114b8ee128356d0482d90e8f0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a link farm designed to redirect users to malicious infrastructure, masquerading as 'hr job interview questions and answers pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates the primary URL is part of a malicious redirect chain. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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=hr+job+interview+questions+and+answers+pdf
    • http://files.opossumbottom.com/uploads/1/3/1/6/131607103/gosiwef_nebuwofup_tugejuxopojotev.pdf
    • http://files.hypnobabieswithlauren.com/uploads/1/3/1/6/131606256/7324548.pdf
    • http://files.halfwaytoitblog.com/uploads/1/3/0/9/130969172/1477955.pdf
    • http://files.unorthodoxphilanthropy.org/uploads/1/3/1/8/131872087/ziregoruxar-kapipepenefekuv-gidawetololenal-mumivam.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/jefifubutuzuwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/77915388996.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/20070946256.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/borodepezakapepujafipavuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/fugonumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/genunakov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9674/files/defopumolonisamuriwokita.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0430/7622/3129/files/zagof.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/91631610807.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7521/files/sezuzapigofolabonozux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/1316428811.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_off000095c9.bin
235fd33320d0392a6d214d3222257dd95cdec9ac7303e07ffbc43cd102ae0292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C9 5340 bytes
font_01_sfnt_off0000a806.bin
9e7f0a9719c407074bdbee25644a0477432f9bc3a9daa17fa37efeacc4b3ef42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA806 10464 bytes

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