Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d1ce1be7efe210…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 22:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57df5bc7f415c7935159dea14227ce2 SHA-1: f68c1252dd993bde8521c7111b509d9837969c15 SHA-256: 90d1ce1be7efe210aa617c0b70181738aedfb68e306531de331e9dd36241dde1
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=to+kill+a+mockingbird+journal+entries, which is also listed as a critical heuristic finding. This suggests the primary intent is to redirect the user to malicious content.

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=to+kill+a+mockingbird+journal+entries
    • https://static.usrfiles.com/ugd/33c377_de7ca3a4f6d348879759c2c0bba2aee4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad69518613604b57992494a838919344.pdf
    • https://static.usrfiles.com/ugd/b8c837_439ca287ba404a629e4fd1e99a16ca19.pdf
    • https://static.usrfiles.com/ugd/b8c837_841d7999e8ec4fa0a094d048a8089940.pdf
    • https://static.usrfiles.com/ugd/5a1791_3e8aab8d296d4f88b624333918a21f86.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/chromatic_harmonica_scales.pdf
    • https://cdn.shopify.com/s/files/1/0428/6952/2599/files/simon_and_garfunkel_scarborough_fair.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/jutilemuluzox.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a9ae132204e4e5d83e4038aca1f278f.pdf
    • https://static.usrfiles.com/ugd/b8c837_595645a606b9452192fa9041e802d36b.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_off00005e13.bin
439a50bdd16626c63d4316edb1f68a0ffccec8cd69ad762f016e69c8ad8793b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E13 5488 bytes
font_01_sfnt_off000070a4.bin
4b5558888f258dbe4d49b5d679afb433b45b752b544fab092060abccd31cd112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A4 10076 bytes

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