Malicious PDF — malware analysis report

Static analysis result for SHA-256 041a51ae6eb819af…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 18:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06f2a403f1fd91644bfde45a830ec48 SHA-1: 87aa67d34de8bd735425d35af8e081e59cd90c77 SHA-256: 041a51ae6eb819af4184a9d3995242e757a47c1aa4e5e60004377d731ce2f583
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a search result for a popular application download. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests this is part of a larger link farm operation. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/wix?keyword=ppsspp+gold+download+apk+uptodown
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_6a144960a525420684dbeacbb8ec8792.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7ad1b28489c4ecb8a9d12318e518c9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b107720b1cf5421ab279440d713f8153.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ef51d24bc884d61b567107d9a91c508.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d00b330d89e41bbb84a22664eb146c1.pdf
    • https://static.usrfiles.com/ugd/ae059d_63978bc1c3cc4af7bcff1068f36f3aa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b5e88116df490986064869769db061.pdf
    • https://static.usrfiles.com/ugd/63022f_953a94c5cbce45e5964ea7881fc8ec46.pdf
    • https://static.usrfiles.com/ugd/b8c837_00ba55cd1e644d8dbd986dc1796c9623.pdf
    • https://static.usrfiles.com/ugd/b8c837_442a99682b674e5989cf22ddb6f6c15f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c019b9e74c742288d9546c192187095.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8971dc1ba2d4eb3bac7a08742d40ac9.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/c_convert_xml_to_json.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/97645480388.pdf
    • https://cdn.shopify.com/s/files/1/0440/5205/4181/files/Kruter_Weihrauch_Grohandel_china.pdf
    • https://cdn.shopify.com/s/files/1/0428/0388/8287/files/shear_force_and_bending_moment_diagram_for_fixed_beam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b30.bin
8484ea36de4165f15b8749fbb2b927fc1fc093d5b458d6a1ec619ded80cf9361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 4904 bytes
font_01_sfnt_off00006bf5.bin
40eb0b44a2695a99465a88f1d6479ef2a9feb9f418fbf9dec65cb899a526a252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 10216 bytes
font_02_sfnt_off00008ef5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF5 4324 bytes

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