Malicious PDF — malware analysis report

Static analysis result for SHA-256 303550f161244002…

MALICIOUS

PDF

38.5 KB Created: 2020-08-04 08:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d5bab37a8a1cc5bc0046afd6c544304 SHA-1: 55d21023d90c7f0100e31b29aec79f0e5d4c5761 SHA-256: 303550f161244002409a5f2df082ce42ffe5fc11896a7277bb609db45bcfec49
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=cbre+appraisal+report+pdf'. This indicates the document's primary purpose is to redirect users to a malicious site. The presence of a large number of external PDF links further supports a link-farming or redirection-based attack. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=cbre+appraisal+report+pdf
    • http://files.craftyfoxx.com/uploads/1/3/1/1/131164033/4611064.pdf
    • http://files.tampasystema.com/uploads/1/3/0/8/130874124/xukepugadamiv_zuxexarelimumod_dulipakev_fepowoxufor.pdf
    • http://files.blackriverquarries.com/uploads/1/3/0/7/130739052/e961b2f074.pdf
    • http://files.motiontmb.com/uploads/1/3/1/8/131860938/37f65ca.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/40487486177.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1911/files/60513137030.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/sorobewevoregusam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/astm_testing_standards.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/1903516116.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/countries_dropdown_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/85177088478.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/richard_jefferson_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/49676300325.pdf
    • https://cdn.shopify.com/s/files/1/0428/3305/1814/files/lemufom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/83008391036.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/30682612983.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_off00005b25.bin
fb261e361fe07df7f1a39d3e75cf4f8d365e776d867e215040556bef0e562a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B25 5080 bytes
font_01_sfnt_off00006c6d.bin
93a12cbf5873ae09445f9be467e7b898ca9caeb10a3b14747ffd66ac6153d598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6D 9636 bytes

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