Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef7b1336a3c1a66…

MALICIOUS

PDF

39.9 KB Created: 2020-08-04 12:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1cf00d09a34369c7d059b87a2347e82 SHA-1: 942080c61784861d6678a09a2e1c3b3af5e82e9e SHA-256: 9ef7b1336a3c1a6655d3c7c0273f1aad59ec80a111ac59ec07fb65cf46569516
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 pointing to Shopify domains hosting other PDFs, forming a link farm. One of these links, https://ttraff.ru/wb?keyword=intermediate%20grammar%20pdf, is known to redirect to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.ru/wb?keyword=intermediate%20grammar%20pdf
    • http://files.millomrufc.com/uploads/1/3/1/3/131378899/57a3e5b7.pdf
    • http://files.mikemythphotography.com/uploads/1/3/2/6/132682790/vozex-vabutijewaweg-xavubonaza-betotemimal.pdf
    • http://xekuwos.c3classes.com/uploads/1/3/0/7/130740510/ratasa_zeniw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/46168938824.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/51962839150.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/kujipugamo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/41527155679.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/18473421712.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/2868611199.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/86577758223.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/55954716923.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6317908028.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7030/files/wow_classic_compendium_of_the_fallen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/15074135258.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_off00005f0c.bin
9cfa70ab964c0a3c27f63e3f3c039a3900aa75e8c1fad4b5d0906cd25c557837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0C 5088 bytes
font_01_sfnt_off00007045.bin
354123ce3d54acfb5a3e8f7e7a0bdb1e9098b542fb16ab08c3f5be4145ebd32b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7045 10224 bytes

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