Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe3f15222d77384…

MALICIOUS

PDF

51.8 KB Created: 2020-07-23 19:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b07880ded5fc1eab12e32d50011d87 SHA-1: f020475ad8f72ba32cc2372b3acbbcaafb947cb7 SHA-256: bfe3f15222d773844bf6dfb65081cffdc5cc99045ca3995cb544c1b809ae8952
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of outbound links, likely for SEO manipulation or to host further malicious content. The document body, though heavily obfuscated, contains text related to a 'surgical clearance letter template', which serves as a lure. The primary IOC is the redirector URL, which is likely the first step in a multi-stage attack.

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.com/pify?keyword=surgical+clearance+letter+template
    • http://files.maryfan.com/uploads/1/3/1/6/131636678/9f0e38e2bb8d.pdf
    • http://files.counselingfornewmoms.com/uploads/1/3/1/8/131872017/8711189.pdf
    • http://files.pinerunosprey.org/uploads/1/3/1/8/131856188/db483f.pdf
    • http://files.stefanomitrione.org/uploads/1/3/1/4/131438299/xixozikelata.pdf
    • http://files.sesamecorner.com/uploads/1/3/1/4/131452942/xisazifovinulex-zubili-welofegupevev-bokonajunovikak.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/rezaxabigukubedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4904/files/96135705222.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dopoworilijilukanozir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5462/0059/files/36959374680.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/34725861108.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/66315267706.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/zegazovafavulodamowixene.pdf
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/xajukedupor.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/47650823176.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/vamafivupa.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_off00008e71.bin
bd9f531e912e342c6dc8f60d59a2b88a3d90a4e841ff0f331abd6dd715b3eefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 4948 bytes
font_01_sfnt_off00009f26.bin
28ce5201f4fda5e467781c8d2bef73e95260b0576002a13f0a58eea243e483ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F26 10156 bytes

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