Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c6290b166fa9d6…

MALICIOUS

PDF

59.4 KB Created: 2020-09-06 02:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ddf88b4b4809976eb19f793f7d0a6da SHA-1: 427fb19d53e5ae333647e544f24878b34bf661f5 SHA-256: 99c6290b166fa9d60423c97eafadbb5bad454664fe0c7ffa606eb1c85519adca
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector URL, disguised as guidelines. The primary heuristic indicates the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.link/wix?keyword=ohio+historical+plates+guidelines
    • https://static.usrfiles.com/ugd/81b904_89e6b40a81a749d3a8a7d6e0aa2fcff7.pdf
    • https://static.usrfiles.com/ugd/74e905_484bce7a87ba4524a618f6f4ef43b389.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e363015ff504085a3de576f5df0ec33.pdf
    • https://static.usrfiles.com/ugd/fac845_de72fc1ed6eb46a98b0247db38fd872a.pdf
    • https://static.usrfiles.com/ugd/4733ca_f90e5c8e8b6d4ca59d831cec068ed8b7.pdf
    • https://static.usrfiles.com/ugd/f08e01_b2ed464b0f0f465ab0107e36719cccef.pdf
    • https://static.usrfiles.com/ugd/b8c837_da5208c95279464f8ddee75f4edd6cd7.pdf
    • https://static.usrfiles.com/ugd/8ff694_c633efe2612b48b785eaa847e8f378a8.pdf
    • https://static.usrfiles.com/ugd/12f4eb_e3344b97b65c4fbbb85dac2d6b385697.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/mabarexepakakuse.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/esl_alphabet_pronunciation_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/muvilezibebisavewafosepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3782/6973/files/dodaguvoropozevibu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/git_pull_overwrite_local.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/67503216261.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/zetafas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094a2.bin
6165aabefada91f2d5cc946730e7664a6b679bd2558063a2674b5f19bbbc2af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A2 5360 bytes
font_01_sfnt_off0000a6d3.bin
2de62095afb05c55cd2f030dbb521f938922208c5b99cbd5b978d50b7666483c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D3 10476 bytes
font_02_sfnt_off0000caf6.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 16092 bytes

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