Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b14368dbcaa8672…

MALICIOUS

PDF

48.4 KB Created: 2020-08-25 20:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b591367215d35380745d69884346c253 SHA-1: 42e2263932cb157fc595bd66bea3e765bf508cf5 SHA-256: 5b14368dbcaa8672521a4f0756ee9369971630e68435c8705a7e3dd092e9b681
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=chaudiere+saunier+duval+isotwin
    • http://files.yestelesummit.com/uploads/1/3/0/7/130775131/regumorikowug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/jodanobevuvoxiredixiwov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2238/files/45763842370.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/47303689936.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/77683440785.pdf
    • https://cdn.shopify.com/s/files/1/0431/1505/3213/files/cheat_sheet_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5840/files/90849034447.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/51410556225.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_off00007b8a.bin
05a905f13cc639da0c5c3d4a7c1a569d8bbc1537a688deca3e0a5e021572bcfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 4968 bytes
font_01_sfnt_off00008c79.bin
0fa22f59e2c3bef0acc5fe13b5a2116269e45db17a3e1fd44ddf2f9540adace0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C79 12380 bytes

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