Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3962451413ba0d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-31 15:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf25a243062000274322245a5ddf632 SHA-1: 657441aa71c2f9e715d07cab9e459bb754e98d60 SHA-256: 3f3962451413ba0d5deddcf338cf881182b330601a510bd16eeaf808d175869a
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one prominent link pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'C winforms interview questions and answers PDF'. The presence of a malicious redirector indicates an attempt to lead the user to a malicious site, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings strongly indicate malicious intent through link manipulation.

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=c+winforms+interview+questions+and+answers+pdf
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/baputizamevutuweludefon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/zuvubonusowebezal.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/madden_20_ultimate_team_beginner_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/pagexoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/mozogowi.pdf
    • https://static.usrfiles.com/ugd/739437_def9c900707b42289189ffc32a545930.pdf
    • https://static.usrfiles.com/ugd/374ce0_bb85b88416264fdc86046d6d3cd4734e.pdf
    • https://static.usrfiles.com/ugd/6240f8_7f45a1f0f5ed4672a0ce6a4c262b5cd9.pdf
    • https://static.usrfiles.com/ugd/99965f_93f5af7577d841cdb6fe420424195760.pdf
    • https://static.usrfiles.com/ugd/f4de5e_22ec4519a1584cfca2fb88cf589dfbaf.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_off00005bb3.bin
f03b690302f9dd49cfe4875202169752a72a8ca273a8835cd6c432d844b7db32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB3 5336 bytes
font_01_sfnt_off00006dda.bin
f4861831253237e2a71eed234c754c526ceb0e24a3ea30402e125091894a72ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDA 10820 bytes

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