Malicious PDF — malware analysis report

Static analysis result for SHA-256 4265bf2a8e95b220…

MALICIOUS

PDF

45.6 KB Created: 2020-08-14 23:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 670910c854f2910f856382435453c35d SHA-1: ee60143d1d38b22e89cddb01b7792425dc1a63d4 SHA-256: 4265bf2a8e95b2209501f1b3fdb7aaf1741781dbb5eb3d7ae6e750357cbf0af7
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. One of these links, 'https://cdn.shopify.com/s/files/1/0432/4153/7696/files/wajimixojage.pdf', is also listed as an IOC. The document body contains obfuscated text and a reference to the malicious URL, suggesting an attempt to disguise the malicious intent. The presence of a download button heuristic further supports a lure-based attack pattern.

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.
  • 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
  • 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/pify?keyword=eastern+nc+saltwater+fishing+report
    • http://files.valuetrainsusa.com/uploads/1/3/1/6/131636825/740c75f538b0.pdf
    • http://files.lemonpatches.com/uploads/1/3/1/4/131408170/0285e64c22228.pdf
    • http://files.shop.crystalcoastcoffee.com/uploads/1/3/1/3/131379268/tirisubujopewanaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/wajimixojage.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/chemistry_book_for_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3669/files/fewoberoleruxesabor.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7090/files/75208178257.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4099/files/16140257064.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/77479224659.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/23772037654.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/420660526.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/debuki.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006866.bin
bc42f6857d90d1991688b55b1a4a425c799f1b1408f96d6640eed447fe8447ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6866 5328 bytes
font_01_sfnt_off00007a90.bin
108211f14b28a8ef065fcccdf9f9a4d6b3a00ecacd1aecfade1f461bacc57826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A90 15188 bytes

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