Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab2d8b509cdfe27…

MALICIOUS

PDF

49.0 KB Created: 2020-08-14 02:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf278f9216afadf50703a5b8e66b15b SHA-1: da0a9716b12c0b391f5b68fdae10c9f5293c3145 SHA-256: 9ab2d8b509cdfe2794d581722b3b507b1e4cf39cef40ab7f646dedeb8037a009
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Carrier hvac thermostat manual', suggesting a lure to trick users into clicking the malicious link. The presence of numerous other links to PDF files hosted on various domains, including many on 'cdn.shopify.com', indicates a link farm strategy to potentially improve SEO or distribute malicious content. No scripts were extracted from this sample.

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.ru/wb?keyword=carrier%20hvac%20thermostat%20manual
    • http://sidujuzom.rebieramoso.net/uploads/1/3/1/3/131379732/nagip.pdf
    • http://files.behrsnecessities.com/uploads/1/3/1/4/131408432/belixazig.pdf
    • http://zuret.bowerarts.com/uploads/1/3/2/6/132695969/gejuganu.pdf
    • http://files.southarborpto.com/uploads/1/3/0/9/130969904/8ec89.pdf
    • http://files.shellknoblakegirl.com/uploads/1/3/1/4/131483148/janov-jimagimazir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3420/files/84801365305.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/land_sale_agreement_format_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/zotififag.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/40940690214.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zokiwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/2825989965.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/translating_algebraic_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/gezagezuritolegol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3523/8301/files/21412014097.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/46882395482.pdf
    • https://cdn.shopify.com/s/files/1/0434/4440/4374/files/62322092774.pdf
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/69718193457.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/raduvegeji.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007adf.bin
c8c63f1604a0b807b8ab58297bbf31c2cc39cd6006a01c56ed87187b8097751d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADF 5004 bytes
font_01_sfnt_off00008bbf.bin
4bd9957b95872ff49f9efe66838747c1de03b86d0a142892938914c461ed3b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBF 13524 bytes

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