Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d791968eb13eec6…

MALICIOUS

PDF

42.7 KB Created: 2020-08-29 23:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 267d2bedae91078834553edebfa02712 SHA-1: 796e2157f635fd9a3b67e778bfaf681decae79c2 SHA-256: 4d791968eb13eec61a302bea600d9ad1ae11b81c358841363fc7302e9009d0fe
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=dragon+age+ps3+trophy+guide, which is identified as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely to obscure the malicious destination or to appear as a legitimate content aggregator.

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=dragon+age+ps3+trophy+guide
    • https://static.usrfiles.com/ugd/b8c837_9021e0a4d19a420d9e7f540be05bb835.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_26b749d60b0341c4b5fd32b24a4c2c1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_242e6c7349734ca393bb30bc558cf335.pdf
    • https://static.usrfiles.com/ugd/dcfb95_43295732229e476eaca31772b3fda36a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bcdf6cb6138444387f37b9c07b1e985.pdf
    • https://static.usrfiles.com/ugd/b65acf_f2243bca15844ae2872a100d4145cfa3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6b032325d904897bf9cf1e87d7ac8a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d4662859d2d47b78cebc99902649495.pdf
    • https://static.usrfiles.com/ugd/b8c837_7716abd5297f4629bca5cf08fa05de70.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/47659690711.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/bojakusafujovanunep.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/79273835195.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95936092566.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fb184f1e6c64fce87677d71e045335f.pdf
    • https://static.usrfiles.com/ugd/b8c837_38f41229ab5145edbf50adf1b5c48933.pdf
    • https://static.usrfiles.com/ugd/b8c837_4894bbb1a51b432d995f3a6f5d64b0ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_13ee047d00e046cb88a652344cdcc94e.pdf
    • https://static.usrfiles.com/ugd/e643da_29e795b52af047148a7b627fe75a476d.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_off0000681d.bin
c806766c8499e392d2834e184c858d4a7187972a83da73497524c57934407e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681D 5452 bytes
font_01_sfnt_off00007a9e.bin
904cf74d99e1e307a0556a116861cc17ded42f59e07f58a7b168d45fb71f7600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9E 10376 bytes

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