Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a40ac18c786860…

MALICIOUS

PDF

44.3 KB Created: 2020-08-22 07:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d3af5118de694eae051c6a418ec6fcd SHA-1: c16e1f042059d094d995496eb0fa550ad7ee6f4a SHA-256: 76a40ac18c78686028b7c30c085407be73880dcb4e5eeb8f3c33f009242603bd
162 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it's a malicious redirector link, pointing to a URL that appears to be part of a link farm. The document body, though partially corrupted, contains text suggesting a 'pay guide' lure, aligning with the SE_INVOICE_LURE heuristic. The presence of numerous external PDF links, many pointing to Shopify, suggests an attempt to obscure the malicious redirector and potentially engage in SEO manipulation for malicious purposes.

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.com/pify?keyword=engineers+australia+pay+guide
    • http://files.helenvanstolk.com/uploads/1/3/1/3/131383580/nedubagomowop.pdf
    • http://files.nancyives.com/uploads/1/3/1/0/131070374/reguniwutedar.pdf
    • http://murafim.heartbeatyoga.ca/uploads/1/3/0/7/130739059/finofiruxanakogokuta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/xotobifamufofibix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4422/files/albumina_humana_bula.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/poc_long_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/0300/1502/files/demaxofivefitoliku.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/bodies_by_rachel_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/43145406791.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0428/7673/1558/files/add_subtract_multiply_divide_decimals.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/vokutowarivutiramorusez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/44882169105.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/68098724668.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/lisa_ann_tonights_girlfriend.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_off00006a61.bin
1795543aa979d862ad8aa406950a69b1986c8ef4eaaa61ebb253636d367c0bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A61 5188 bytes
font_01_sfnt_off00007c1c.bin
b83023733068454f73fd2f00d4fcdcd8f936955be55fc97e8b0d98535690d683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1C 12496 bytes

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