Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc304fb1e52d0ba5…

MALICIOUS

PDF

36.9 KB Created: 2020-08-31 17:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f11a9cbe39a6f9121a45c8e0189b25 SHA-1: 987c3db9c2b6211fd73d23295fdd823e1423d073 SHA-256: fc304fb1e52d0ba51b45fe1c989a9dfc92d9201e05db8f66b1130975bbac5873
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=glencoe+health+chapter+11+answers'. The document body, though heavily obfuscated, appears to contain text related to educational material, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links further supports the SEO link farm heuristic, indicating an attempt to manipulate search results for malicious purposes.

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.cc/wix?keyword=glencoe+health+chapter+11+answers
    • https://static.usrfiles.com/ugd/79e5df_f316a58a5f4f40ca9956332e29356c8f.pdf
    • https://static.usrfiles.com/ugd/0df15e_9147b2fc4acd42d0bf99787b1ceb49c9.pdf
    • https://static.usrfiles.com/ugd/c1615c_d5cf7c4763754b3d8e2da304c6dd3010.pdf
    • https://static.usrfiles.com/ugd/f63f29_f0d4a732791f41e8bbf76a8bd504a440.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac398deca5044b7582632b355e49fdfb.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/febujazafefojemoluno.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/lelonoturusalesariporamu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/91926094817.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/5072114046.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/independent_practice_worksheet_classical_operant_conditioning_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/90091154182.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2524/files/sobaposezajutobuwigob.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4427/files/zotefisiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/ruzafidusarazipuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/57752705944.pdf
    • https://cdn.shopify.com/s/files/1/0440/6503/0309/files/shape_tracing_sheets_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45865267400.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_off000052d5.bin
d8a63df996528b112a1c3120a84d8af7d85424a0ef74c9363bbc189e4fd60ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D5 5196 bytes
font_01_sfnt_off00006492.bin
8c6f8a389a6c6445b46cd2b4fd6d5c4c8d92289b5d6c80579cee84c0d1f711a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6492 9964 bytes

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