Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5332ff31f2202e3…

MALICIOUS

PDF

35.9 KB Created: 2020-08-09 09:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648afe0c8633d4953340b4e1e7b07f7d SHA-1: 379ee29f2bfab1be4dd63c00cc830e68de7d1957 SHA-256: d5332ff31f2202e361b3d8aea4e6ec87b2738a6cef49e3554dc027c0a774f2ee
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the PDF is designed as a link farm to distribute traffic to malicious sites, likely for phishing or malware delivery.

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.ru/pify?keyword=idodo+umeh+college+biology+pdf
    • http://files.bulldownproductions.com/uploads/1/3/1/3/131383333/wogivu.pdf
    • http://files.oneofthosedays.org/uploads/1/3/0/9/130969925/5530383.pdf
    • http://files.majestickilimanjaro.com/uploads/1/3/1/4/131453214/4436368.pdf
    • http://files.frodshammethodist.org/uploads/1/3/1/3/131381772/1924726.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gowaluzefep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/29120586107.pdf
    • https://cdn.shopify.com/s/files/1/0428/7037/4559/files/kiliwig.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9625/files/biregarezuzu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9920/8346/files/83633641086.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/23084765338.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/jiturenutatowupuwozono.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/xivumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/vorewijidofasekiburukiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/43547363477.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/84089053472.pdf
    • https://cdn.shopify.com/s/files/1/0433/5163/8175/files/31948551029.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_off00004cdf.bin
f66104fb592f798c9c5cb0dd5977fb8025d3797c08ff112307919b3a704f30e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CDF 5264 bytes
font_01_sfnt_off00005eb4.bin
15bd572c6c701c62824cea25e703e5ba2ecdea1e4116690640ffda87e0e730e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 10152 bytes

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