Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d49a86dec1966e…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 16:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3499d671d245db4f236164ca9c2bbac9 SHA-1: 396af1fa89037d385d30316ab4dbe5919f6774da SHA-256: d9d49a86dec1966ef0823817fc272a1c5bad7fe53155b6f54a3b329ac7fc9c75
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm, likely intended to lure users into clicking malicious links under the guise of providing repair manuals. The ML classifier strongly supports the malicious nature of this PDF.

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=mazda+b2200+repair+manual+free
    • https://static.usrfiles.com/ugd/ea2f88_206ca1b4ca684ec1a191d863b9002914.pdf
    • https://static.usrfiles.com/ugd/739437_de8df3c3e8cd4bdeb1d4b1c3efebbef0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b30166810744730a5fff6f5805142f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a44fc9681047a7a18a1bb62915b09d.pdf
    • https://static.usrfiles.com/ugd/0d2908_076b47e42a3448b283fd7cf217962a54.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c266b54b4b447ba8891eae0752843d8.pdf
    • https://static.usrfiles.com/ugd/696117_34144849849a47788855f76f2d4521ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_32975b8428db4debb5f0b5f227053f85.pdf
    • https://static.usrfiles.com/ugd/b8c837_c81574f1bc3e4fe6a135adce403a74a5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/44559355186.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_off000054c8.bin
acd6bb4548b3849ad0d093b09a08d9e62af72bfc8770db4eb88a3bc2fc0faaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C8 5476 bytes
font_01_sfnt_off00006754.bin
1bc911ec3af9a9acc3110d2584f59779fbbff74fd3b40e98518450926c774d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6754 10068 bytes

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