Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af01b2fc539cefa…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 06:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74e933b6ab76bf6e98fd5671720546f3 SHA-1: 3576cb61c7ed247559c4e16d893ffb2c6e62a057 SHA-256: 0af01b2fc539cefa04a8f5747247b6c66506d000af1ae03dc5d30e466de3a7c1
154 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 external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=body+organs+matching+worksheet', is flagged as a known malicious redirector. This indicates an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly suggest a phishing or redirection attack vector.

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=body+organs+matching+worksheet
    • http://zikar.elriograndelanettal.com/uploads/1/3/1/8/131871745/torinabosovuzox.pdf
    • http://files.stevescustomcarpentry.org/uploads/1/3/1/4/131437980/vuxuliwexozirajub.pdf
    • http://kivusik.detailingbyjonathan.com/uploads/1/3/0/7/130775803/9065665.pdf
    • http://files.dawnjacobsonmd.com/uploads/1/3/0/9/130969480/3b963.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/92573628881.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/45145752984.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/cambridge_beginners_english_test_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/9940599816.pdf
    • https://cdn.shopify.com/s/files/1/0434/5695/4518/files/html_codes_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/annotated_bibliography_example_mla.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7787/files/cat_140h_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9858/files/96493926503.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/filiduses.pdf
    • https://cdn.shopify.com/s/files/1/0440/7833/4117/files/napix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/fulunukorumoretar.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/l_anesthsie_dentaire.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_off00006b36.bin
a050d9e2fb421bd0be72b326bac32393794db963b2262a826514e5b708ddb859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B36 5628 bytes
font_01_sfnt_off00007e41.bin
22f4cd8bf8781a82a8936afc15397681cdfff7a9a764463980a6a6b8a1998418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 10192 bytes

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