Malicious PDF — malware analysis report

Static analysis result for SHA-256 0230a7ca0284160d…

MALICIOUS

PDF

37.1 KB Created: 2020-08-11 15:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bad5d664b88df413523bdc12edcac867 SHA-1: e487a9af0d1d33330bc1cc56ad0308561df1f140 SHA-256: 0230a7ca0284160d5841601c4ff5ec0f9b4f0ddfb715f467c8a3a956d618d4b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Cambridge English for the Media Student's Book PDF'. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely as part of a phishing or scam campaign.

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=cambridge+english+for+the+media+student+s+book+pdf
    • http://files.drickahair.com/uploads/1/3/1/4/131438658/6269460.pdf
    • http://files.odinshorsewoodworks.com/uploads/1/3/1/4/131407406/dolibiguwe.pdf
    • http://files.faithinteriordesign.com/uploads/1/3/0/7/130775505/katufekebi-ketozel-tunowibeni-fuzuzodi.pdf
    • http://jatalaxek.comoxmobilemassage.ca/uploads/1/3/0/8/130814328/kuredosuvezokefiles.pdf
    • http://files.northernsmokers.com/uploads/1/3/1/4/131437464/sodom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/pajejamugiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/69557117469.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0714/files/first_law_of_thermodynamics_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8697/7949/files/60636520348.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/14962738638.pdf
    • https://cdn.shopify.com/s/files/1/0436/3878/4158/files/kekokakutuzigu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/62823104211.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/linux_command_line_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0432/5526/7496/files/riguf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/38803814892.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/zefelavapobegabewunosoka.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/8438617664.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.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_off00004e93.bin
83c79c98ec476b81c6736577b7eeebe864c81c61d59d5a2bef353c8ed88de936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E93 5564 bytes
font_01_sfnt_off0000614d.bin
ca8b2db9c85535de824f52f346aa03eeecd55e7ef5894ca74b3d84d24616c520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614D 10936 bytes

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