Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e9fc7279e517bd…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 05:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a95b1077c39c59c34d56db6a68ced7 SHA-1: 86f31c27e696919c8fbb36d58b1d413b98dc7502 SHA-256: 21e9fc7279e517bdce58c409414e37291a431833b52c1e2cbc6137005ae38852
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary malicious IOC is the redirector URL.

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/wix?keyword=iambic+pentameter+worksheets
    • https://static.usrfiles.com/ugd/b8c837_a846efa9854d47ff9a344078faf818f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_895bc1339dad4deebd748217b346c316.pdf
    • https://static.usrfiles.com/ugd/b8c837_70ea986a99f647a39e252f77bb668ac2.pdf
    • https://static.usrfiles.com/ugd/b8c837_019096de12f24e95a47cbc0fdde67012.pdf
    • https://static.usrfiles.com/ugd/b8c837_d41ebc1c0c414217ba1cb1f3862fb80d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7101b0d36d224c09a1dfc957bd7963af.pdf
    • https://static.usrfiles.com/ugd/b8c837_2abca645f0c7424a96539370076e6bf3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9409c01551b4dadba2efda7128ec2df.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bf9084d3be24966a898327ec7269829.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/85001937103.pdf
    • https://cdn.shopify.com/s/files/1/0430/2992/1943/files/34168524367.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/sojasazosiwa.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_off00005eb8.bin
c4a21a382cec555622f3c53432838ac35fcc3048a5df0323841d1296c8d4081e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB8 5376 bytes
font_01_sfnt_off000070e2.bin
cb63bddb5fd11a9f3fa325886073a89ff6a91a817b9dbfad1b58bee9d5dd8686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 10592 bytes

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