Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfee6b29faa46919…

MALICIOUS

PDF

41.0 KB Created: 2020-09-06 12:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da53ca8847476d33e5720c843746f6d6 SHA-1: d2ae6d2e8a8d7fa656e659e64227980196c5532c SHA-256: dfee6b29faa46919af37799a794ca03d5e350983552459a17246571fcd41084c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Ember js guides' and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=ember+js+guides
    • https://static.usrfiles.com/ugd/b8c837_3e6028287d0e476e80f2e59dde7dd58e.pdf
    • https://static.usrfiles.com/ugd/b28ae2_9943ae8b3a504f63be3886a785e42b09.pdf
    • https://static.usrfiles.com/ugd/fdee49_a83b2df39f284025abd9e11d57734f02.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/80519937332.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8434/files/phylum_arthropoda_general_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0452/2229/7760/files/ajaccio_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/28620654841.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/safejaxifemofukamuj.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_off00006372.bin
bd5126cef38697eee1b069bf122b1c5e107d93faa0d1094145d742edae88aeca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 5076 bytes
font_01_sfnt_off000074a4.bin
c00445c2f604b46113832775c203747e08f2d40951f39a615fd2417ba5c7aab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A4 10348 bytes

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