Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d913989412991e…

MALICIOUS

PDF

45.6 KB Created: 2020-08-07 02:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1babd07cc0a5e4d27b56ab9752b4e3 SHA-1: f91cee838d83abb1008daed20477f61a9a8cdcb4 SHA-256: 78d913989412991e3e8418554a9854d8985cb6a5a1a9c69288a4b9299e91130a
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary link identified leads to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request to encourage clicks.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=thesis+about+teaching+strategies+in+mathematics+pdf
    • http://files.apparelfromhazy.com/uploads/1/3/0/9/130970016/04fee4a271755e0.pdf
    • http://files.sealshop.org/uploads/1/3/1/4/131438571/9b2aef5.pdf
    • http://files.jiniepku.com/uploads/1/3/0/7/130738620/e7619.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9725/0205/files/43811967675.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/chemical_actinometry.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/42482349572.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/1910414941.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8921/files/90711888453.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/91322196516.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/37028862068.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/waxutaxikidamakuwizubix.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/khng_m_c_file_trn_web.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/15813251812.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/fivatunoweziteli.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1189/files/ccleaner_license_key_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57515970725.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/93602048811.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_off00006e13.bin
1bc5bd3a879f43608145ceebae6ee38deb1ef15d352012d17ea0af0df422b893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E13 5624 bytes
font_01_sfnt_off00008102.bin
9a961717305c6bda03658c73a510ed1af913d3311e2091fa6bfb612676581cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8102 12792 bytes

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