Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c5e83393cdd7e8…

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 18:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fee6b64f7fe65ffe9657b46c109bae3c SHA-1: ff7757fc1b9b56cd4a3109e2f69ba278b72a91a9 SHA-256: 09c5e83393cdd7e8381c8041e96bf86720ad20d601629d2ab7454e2ddec04a8d
162 Risk Score

Malware Insights

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

The PDF contains a lure for a 'wifi driver' and embeds numerous links, including one to a known malicious redirector. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the heuristic for a malicious redirector suggest the document is designed to lead the user to download or access malicious content, likely through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wifi+driver+for+windows+7+32+bit+dell
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/75972733897.pdf
    • https://cdn.shopify.com/s/files/1/0441/0589/1992/files/minimalist_osu_skin.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/ahron_bregman.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/archidoxis_magicae.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/buderus_logamax_plus_gb062_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/34492869829.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/shurflo_4008_101_a65.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/35272979543.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/anxiety_assessment_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/catcalling_definition.pdf
    • https://static.usrfiles.com/ugd/33a2e4_5ff804474616446f92155eb1421c37b7.pdf
    • https://static.usrfiles.com/ugd/362633_95199e5dae5d4df89bf009d0029f066b.pdf
    • https://static.usrfiles.com/ugd/4d6844_98b24d6aa4084dd184dd899673c6b57c.pdf
    • https://static.usrfiles.com/ugd/1decf9_48dc8fcd4f22476fb0decffdba22b63d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b20d20333fd54f07919684d9d5812b5d.pdf
    • http://www.dell.com/
    • 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_off00005810.bin
d8e5997e88af6378786de32d98a9de9ff1ad0f15a02cd38694518d3e484d9a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5810 5372 bytes
font_01_sfnt_off00006a8d.bin
f53f5e640df4fb634d23f723f513a7caf12995670f487e79945a3e422f3d2923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8D 9944 bytes

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