Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df959f2c906e213…

MALICIOUS

PDF

38.3 KB Created: 2020-09-01 15:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f7c7caf5628633b8560309087e82db SHA-1: 8e6f376a89af711b4b33d9fe5a71546cddc72b3f SHA-256: 5df959f2c906e2139b5220ab61a392af8e30bc2f39e827807348c025eba87d09
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a "4k video player for pc". The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=4k+video+player+for+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1e4819_1ead5c0044b84aa9971fb19c31594041.pdf
    • https://static.usrfiles.com/ugd/c0fca2_646a57200c2d4d36961605541094a6a7.pdf
    • https://static.usrfiles.com/ugd/c068f8_7d0227b958aa460eb39d501554f8ddb4.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_911a5be07b1f46899ae9c00fca4eac4e.pdf
    • https://cdn.shopify.com/s/files/1/0435/2147/4714/files/downtown_dallas_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/60149683385.pdf
    • https://static.usrfiles.com/ugd/e33828_50d9112313d4473097cfcc07fb88dc7b.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_05bcc653139a4e7eaf2fdae9dcf635f5.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000589b.bin
bb1616f03f11186f25c0a32ec2ba5ab99528c3cc78c9c1ead852efecefed5089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 5192 bytes
font_01_sfnt_off00006a6e.bin
4e0367414e6f9f1f55ecba48eda80cb57cb33840e00c125527ad564560238965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6E 10220 bytes

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