Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d54ca6b261eea3e…

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 04:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db3b2dd1921983f2ce6129bd01caafe8 SHA-1: 523672bb6ec4e775998d12e5b004ca1d10064b70 SHA-256: 5d54ca6b261eea3e5ddc9ab972dc433abd5abd41da9d53e2eff4832443685852
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 20 external PDF links, one of which is a known malicious redirector. The document body text is obfuscated but contains the URL "https://ttraff.cc/wix?keyword=creepshow+2019+parents+guide", suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=creepshow+2019+parents+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/46639844442.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/faxexutomiwan.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/wudagusoguduparopesog.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/papigafasagakivibukajit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/convert_to_visio.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/zorakedu.pdf
    • https://static.usrfiles.com/ugd/865d50_9c6e562686e44f4fb34781e98f34fd1b.pdf
    • https://static.usrfiles.com/ugd/5e8de6_68f675bb841b4606a849f1897705a6cb.pdf
    • https://static.usrfiles.com/ugd/49be48_536cf2e6a3b34908ae9184618a253b8d.pdf
    • https://static.usrfiles.com/ugd/45e30f_26f6a5dd2fa04578a1e7a0445849cbf1.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_off00006e4c.bin
2e9331a3c3ba3be992a30301534875b1aa7b88e893b2502f8ba1412287674c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4C 5668 bytes
font_01_sfnt_off000081a4.bin
5c40b33730b9ba5fbb9375f99ba0dfac97b9caaf940b4dc9b41a402583204308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 10512 bytes

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