Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a47b2c7a5a96c5e…

MALICIOUS

PDF

46.9 KB Created: 2020-08-30 11:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 377b3c5bc51812a40a1a5cbaa1ef687c SHA-1: e982bbb39947ddd3a301ea0f976025dfe9341cbe SHA-256: 0a47b2c7a5a96c5e39520897a136487efdb822e512559c18108f309d92ca14f5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/wix?keyword=caddo+parish+school+board+number'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, with the first being 'https://static.usrfiles.com/ugd/b8c837_d3e1e33ee8e147dd8f8349ff164afa72.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of malicious intent.

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=caddo+parish+school+board+number
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d3e1e33ee8e147dd8f8349ff164afa72.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_ce2af2fecbee4cc19a8bd739023f17be.pdf
    • https://static.usrfiles.com/ugd/b8c837_9010707b508d4fe29e5c843adfd177c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_424092784b1441f19ed5e9047d8dc79f.pdf
    • https://static.usrfiles.com/ugd/de60da_45431c2a81ad4aa492d92ba76cbefb47.pdf
    • https://static.usrfiles.com/ugd/b8c837_607fbfb1d5f645238b825f8f09e0339f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bc31f4d6b524514a431ef7b2747371e.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_9d147aaf7f414bc3a821ad02c0f01cf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a099aa030a84d0eb09d07f9fefb500f.pdf
    • https://static.usrfiles.com/ugd/accd1f_4d8e4dfb76084210ac1478833448aae1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/57398240997.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/rimunovulagedize.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/99350101333.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_off00006e16.bin
58ff7bd303f3d87e7efbc99de245e252f1c82800a7b831f8f30971b92b98e311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E16 5356 bytes
font_01_sfnt_off00008016.bin
38c5d38800fbded32717e2b95a1b2f38afaca5c49d4302b9d7e2f50a4f9adcaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 15160 bytes

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