Malicious PDF — malware analysis report

Static analysis result for SHA-256 195376b3891b4bae…

MALICIOUS

PDF

41.1 KB Created: 2020-07-22 07:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 223b9132492c9ca776d6e3ac42d90a7f SHA-1: 698ad83d52576b84d8edc06530b0f2f52aa8525a SHA-256: 195376b3891b4baeaf1d9bfae3fc122fe1540d38b196ae1e0a9c6895956912ac
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'free software to reduce pdf file size online'. This, combined with a high ML score and the presence of a download button lure, indicates a phishing attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure.

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/wb?keyword=free%20software%20to%20reduce%20pdf%20file%20size%20online
    • http://files.novicefarmer.com/uploads/1/3/0/8/130874668/seduwafibulipituk.pdf
    • http://files.dogwooddoodlebugs.com/uploads/1/3/1/4/131406843/307724.pdf
    • http://files.newmantoronto.com/uploads/1/3/1/3/131380992/173815.pdf
    • http://files.hungerfightersoregon.org/uploads/1/3/1/4/131409693/787779.pdf
    • http://files.gymnitai.com/uploads/1/3/0/7/130739490/fetopejivezeki-wawikeni-xutesaj-mevosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/27329422645.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/95047529314.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/pomol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/zeroforovoluxigejofusu.pdf
    • https://xevofoz.files.wordpress.com/2020/07/gimudulorumazufamid.pdf
    • https://nigosuwotobe.files.wordpress.com/2020/07/bidufujubowoxebi.pdf
    • https://xebedidepu.files.wordpress.com/2020/07/jekivesuxabudadowotov.pdf
    • https://taxofer.files.wordpress.com/2020/07/98701588093.pdf
    • https://dasinejufefu.files.wordpress.com/2020/06/91518449835.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/pexipetunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/sigebis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/dupovodotegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/xukomuzapeno.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/fetuwubomugoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/gaduk.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_off00006378.bin
7ab056026afca3da4f4cd90eb4ac8e40cc4085d8fa55cde546b562cc2039f2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 5128 bytes
font_01_sfnt_off0000750e.bin
108fe007b2b10eb23754ba62890958ef6d0a275f122925db4939942e977828b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 9780 bytes

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