Malicious PDF — malware analysis report

Static analysis result for SHA-256 81157f241539052b…

MALICIOUS

PDF

104.3 KB Created: 2020-08-31 17:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5451f2e6dd513055529ba7eaf086e3d9 SHA-1: 41940b91b4df0419b8c29a19e6acf1b69ee3fabf SHA-256: 81157f241539052bc0570691413c3c362ae81dc8b5f3446cdd4d6bb278805eb0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru, which is likely used to host or distribute further malicious content. The document body, though partially corrupted, contains text related to 'endocrine society guidelines vitamin d' and a URL, suggesting a lure to trick users into clicking the malicious link. The presence of numerous PDF links, many pointing to Shopify, indicates a link farm strategy, likely for SEO poisoning or to obscure the final malicious destination.

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/pify?keyword=endocrine+society+guidelines+vitamin+d
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/pivetugidigatam.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/zojafuvevilolonepukaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/rational_function_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0469/0336/1698/files/safuse.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf34964ee53040f0ae4f55e428970441.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/rudigukakupob.pdf
    • https://cdn.shopify.com/s/files/1/0439/1524/7771/files/human_anatomy_for_artists_eliot_goldfinger.pdf
    • https://static.usrfiles.com/ugd/09273f_dcbf684a372048a1802e8bee683b554d.pdf
    • https://static.usrfiles.com/ugd/b8c837_85ce0891ebfe4382ab458826ebf6b0b0.pdf
    • https://static.usrfiles.com/ugd/e5a943_a4256ad4427d45febce18e7e55bd4553.pdf
    • https://static.usrfiles.com/ugd/96768c_b4817ccab79946c08a603df4ae6e5254.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_b0aaf64d0ba042b1ab1da00c7d8f2824.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014704.bin
eca45811b9dc3b9595f99586f3614b3653e81be9cd41abeb44b01f6f259b8751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 5380 bytes
font_01_sfnt_off0001594e.bin
a19c2d109aba61e42d23ddb6b2c3d5072e61445810766f8e4fc58338c50fc69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1594E 10572 bytes
font_02_sfnt_off00017da6.bin
2306e25e99b459a83d41579ca09174a7ef8118e5c6f4b350d14398a0d5a0e030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA6 16388 bytes

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