Malicious PDF — malware analysis report

Static analysis result for SHA-256 8552453d01a553ad…

MALICIOUS

PDF

48.3 KB Created: 2020-08-29 22:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c49f366d29ea3b51a35d56652da7b5a SHA-1: 5aa43501d259956102f1e0f7af2ff9cf366f7d5c SHA-256: 8552453d01a553ad8b3aa3c9228062c86c2555b0c4025fb6e48c1c3f5c88ff47
162 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, specifically pointing to 'https://ttraff.ru/wix?keyword=precious+lord+take+my+hand+hymn'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links. The presence of a 'download button' lure further supports a phishing or redirection attack. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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.ru/wix?keyword=precious+lord+take+my+hand+hymn
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/fumexolet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/3765870955.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/21530597344.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/47884051932.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/dukubobugofipefesarosof.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1130/files/75968335430.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/cambogia_extract_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/8829307040.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/16030555954.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/subil.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/49107719245.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1175/files/50_sombras_mas_oscuras.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/wizeladexikefisama.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b5.bin
a1fddce649f137e5df2e36454aec76b5b0a311d174d94ce509bfdf9a06569e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 5228 bytes
font_01_sfnt_off00008347.bin
53736e9cded8cdf15e807b591f98ecc896cc9418b364c6054d0c8477a81e655e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8347 10192 bytes
font_02_sfnt_off0000a620.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA620 4324 bytes

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