Malicious PDF — malware analysis report

Static analysis result for SHA-256 881b81a03a9fc16b…

MALICIOUS

PDF

41.2 KB Created: 2020-08-04 20:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b14f0905fc801b3c53f18f3189c1c50f SHA-1: f4f3a7061444ddbf8203f06cd4caf645fe505390 SHA-256: 881b81a03a9fc16bd362e5f14d44657b06424d3ddb09644067d89f92ea0896e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to Shopify-hosted PDFs, forming a link farm. One prominent link redirects to a malicious URL, suggesting a phishing or scam attempt. The document's content is minimal and appears to be a lure to encourage users to click on these links.

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/wb?keyword=stoves%20electric%20cooker%20manual
    • http://files.plaincommunitychurch.com/uploads/1/3/0/7/130775561/1243776.pdf
    • http://files.stannesrathangan.com/uploads/1/3/0/9/130969655/zufurabunavopor.pdf
    • http://files.kccbiz.net/uploads/1/3/0/7/130738696/b673e4.pdf
    • http://files.nostrings.co.nz/uploads/1/3/0/8/130874382/xemuvag_kumedo.pdf
    • http://files.wildflowersfloraldesign.com/uploads/1/3/1/4/131408131/mozegenukabobabumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/85335712192.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/12074046604.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/nesavopitugunuxapudafole.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/9475865735.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/ligagisedaxijusov.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/vbox_guest_additions_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/3086/3259/files/26897715402.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/804181704.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/42309158178.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/branches_of_linguistics_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/89645353701.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.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_off000062f6.bin
1100136c70d2797b63029f817ac47c55c68f2fccf2c62de8e166d7d151a951a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5172 bytes
font_01_sfnt_off0000747b.bin
33744e06ba5e8981837c2d123d87208e26ba2d8b15ae81a455c4dcc75ae2c9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747B 10384 bytes

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