Malicious PDF — malware analysis report

Static analysis result for SHA-256 705c31b17a5bbae6…

MALICIOUS

PDF

50.6 KB Created: 2020-08-15 01:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41f900af916c03ba3fa4b9eeca07073b SHA-1: 8c1ef9a7d74a91f30504eb712cbda94e92679fb6 SHA-256: 705c31b17a5bbae6fee8aaa05ba5e2aff0684c88aa7e93e934984a157a8e6fac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'renaissance art characteristics pdf' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the redirector suggest an attempt to deliver a second-stage payload.

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.com/pify?keyword=renaissance+art+characteristics+pdf
    • http://files.skyehighlanddancers.com/uploads/1/3/1/0/131070579/75fee.pdf
    • http://files.mrsdemars.com/uploads/1/3/1/3/131381363/6449566.pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0278/1083/files/64142989347.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6678/files/kujofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1666/6786/files/feketenevaludemugipubif.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/e9_81_87_e8_a6_8b.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/9330090398.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/16710205368.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/vesoriveretamuzixowuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/philips_respironics_system_one_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/jevojekavexatekeleka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/basic_spoken_english_test.pdf
    • https://cdn.shopify.com/s/files/1/0448/3461/9549/files/convert_to_docx_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/4272103693.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_off000088dc.bin
dd75f6a67619923817288eb9374c1725cc2b92076a8b2d111677c0128c64ece4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88DC 5220 bytes
font_01_sfnt_off00009a94.bin
c62614032830bdfc5de85f4c8d0b0a12861e5ee0d7a76933acb83e45ff01e095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A94 10112 bytes

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