Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3ca4a2c929427d…

MALICIOUS

PDF

47.0 KB Created: 2020-08-20 09:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05d6fd42ec1346ccf94ec561e7228436 SHA-1: 082c02fa5e03bc20c06f314fbb1e2cce3beaf180 SHA-256: fb3ca4a2c929427deb7d0d1a13d3e1303041c516209cc3c4dfd28799c48453c1
150 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 of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.cc/pify?keyword=master+business+informatics+mannheim', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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=master+business+informatics+mannheim
    • http://putavu.obsidianrenewables.com/uploads/1/3/1/1/131163774/8547438.pdf
    • http://files.briona.org/uploads/1/3/1/4/131437513/5748985.pdf
    • http://mesiwamad.kcldentalsociety.com/uploads/1/3/0/8/130874540/9082146.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/nitanax.pdf
    • https://cdn.shopify.com/s/files/1/0446/2074/2819/files/12494176719.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/old_deviantart_layout.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/28872298195.pdf
    • https://cdn.shopify.com/s/files/1/0429/0261/8278/files/loxewigumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4829/4807/files/1212825564.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/62198305809.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3507/files/fizejisolojenefulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/43243161412.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/47220387043.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/5098523079.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_off0000796d.bin
6780df2a5b1147a1c49f96d704b3c309e8a002744a9ad766da5aa2de0f1ca6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796D 5236 bytes
font_01_sfnt_off00008b0d.bin
d12a87103b907b0f674ecb5dd3bcdf3c9c698b7b81cf0cb518e01080fd973ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0D 10808 bytes

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