Malicious PDF — malware analysis report

Static analysis result for SHA-256 7128282b2d736e6e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 07:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd77d8a8c3ba68bfb0e230b8ea11e4eb SHA-1: 3b2b53cc4dabfdeb953e333222b4b7a3bfd66b22 SHA-256: 7128282b2d736e6e0f17b2d19374fc63cc394155eefa67b02d2c73f69a618338
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a worksheet. This indicates an attempt to lead users to malicious infrastructure, likely for further exploitation or phishing. The PDF also contains a large number of external links, suggesting it is part of an SEO spam campaign. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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=surface+area+of+cylinders+worksheet+kuta+software
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/38eac1_ad48919470fa4c848d8758f0d93dc143.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cb4107600054da8b5f169b8a7abdea4.pdf
    • https://static.usrfiles.com/ugd/b8c837_dff7c2f01dfb49fc867614780af3b1a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4fca41c453b4f93bd41336a055fcee9.pdf
    • https://static.usrfiles.com/ugd/d1d005_bda4ab0c052347bb97d59d37dde355d0.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_8741e5ff11834de885ccc3d1dd370180.pdf
    • https://static.usrfiles.com/ugd/3b7182_d2158b659ad34e8895649d9ac746b322.pdf
    • https://static.usrfiles.com/ugd/de3d83_4040c32f60ae47bdb59824980b72d817.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7493162631d4435b092bae9165f26ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_517b4ec932634a7c88d540facb71d5c9.pdf
    • https://static.usrfiles.com/ugd/8ba634_bef3abac1c0e4981997b6a16a1cf5086.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/48316200320.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/lenukakupidawipufozevuda.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054aa.bin
7c0fe658ec616d600e62bc8a686581fb8bdb360e8c7bfe71e50c0d12681294a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AA 5468 bytes
font_01_sfnt_off0000674b.bin
23b83e1b303aea1cfbb5b560748c2a87ea416f230c57cf9d082304fdc74f0103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674B 10700 bytes
font_02_sfnt_off00008be9.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE9 16204 bytes

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