Malicious PDF — malware analysis report

Static analysis result for SHA-256 613dae7e6a40a42c…

MALICIOUS

PDF

39.2 KB Created: 2020-09-02 01:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad49cd4271a2ab031f93106bf21b8f43 SHA-1: 64bdad5fc3a4cefacd2aaf282c68b2c6a91f4fbc SHA-256: 613dae7e6a40a42c9679e18cd52930ac67b3df797546a921cf2d14df9839a7ea
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Nakuru county bursary forms' and the malicious URL, suggesting a lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious redirector links.

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.link/wix?keyword=nakuru+county+bursary+forms
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/the_lego_architect.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/fiviwasil.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1092/files/vumuratokijelefunoganiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/1076/6486/files/moment_of_inertia_of_t_beam.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_5e4abddb8a8144af81318dccea639224.pdf
    • https://static.usrfiles.com/ugd/4dd980_0431bae8223e4d529658ef0dbbbc3932.pdf
    • https://static.usrfiles.com/ugd/e02969_3a16a25d3b1045a0b574f00b77e5afa8.pdf
    • https://static.usrfiles.com/ugd/9e53d4_555397280b52438683b46b7c40da0f77.pdf
    • https://static.usrfiles.com/ugd/2d1648_dd7b615271494aa9bf52fc4d883eac51.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/luremunoredofugigudogumad.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/text_mining_with_r.pdf
    • https://cdn.shopify.com/s/files/1/0428/3452/6375/files/ledokiwupuxipuvitag.pdf
    • https://cdn.shopify.com/s/files/1/0433/1254/5950/files/buzusidaralofaketivil.pdf
    • https://static.usrfiles.com/ugd/f63f29_a573c73748634cdfb36769449a201658.pdf
    • https://static.usrfiles.com/ugd/d01287_ce87a0343cfb41548828a27f56564f1a.pdf
    • https://static.usrfiles.com/ugd/97368a_875598dd8fce40cf9b50b6d239b7b598.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_off00005ca0.bin
de4ea37a7c0f25a1db737eb33a9c5ca5fb3a90e36a6bb9b35a32845026f4e083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA0 5268 bytes
font_01_sfnt_off00006e8e.bin
356409ad7cf62316fbcaadf372149ed122847ff2985a1815508da584bc180419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 9800 bytes

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