Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3b66f1cc51787c…

MALICIOUS

PDF

51.1 KB Created: 2020-07-28 03:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced183a4c02790abc07c21f3adff2a1c SHA-1: 734174fee78d0d1b365572c220a4d29c35405eb5 SHA-256: 3d3b66f1cc51787c2b1fc72529ddf61f99909e57ac521e8f4c594b699e7b4f03
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, with a critical heuristic identifying it as a link farm pointing to external PDFs. One of the primary links redirects through 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=solving+linear+equations+by+substitution+worksheet+answers
    • http://files.generationsantiquesandmore.com/uploads/1/3/0/8/130814283/342075.pdf
    • http://files.glaciercitygardener.com/uploads/1/3/1/4/131437633/mogol-buvaropap-rofim-rulexebalav.pdf
    • http://files.rescueber.org/uploads/1/3/2/8/132814958/584fa4410c.pdf
    • https://cdn.shopify.com/s/files/1/0438/8811/5867/files/fidexuwogibewonavawipap.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6840/files/rubalipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/kurevilalunizus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/27681350902.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4179/files/bepubupavivunujof.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/duvedulojadelijadaxelupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/37950565024.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2048/files/48869177701.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/40564781953.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/rasowunurewawipejif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/38353930382.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007391.bin
6db9722215a0e6aed71d35034674a4007a9e2685eafc8f921ddde9d2eaf32331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7391 5516 bytes
font_01_sfnt_off0000865b.bin
a236ff4e71ecef1088d4fb70cd30f5f7aac6136f9da58de26a66fcad4468298a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865B 10080 bytes
font_02_sfnt_off0000a8f4.bin
3cc505d749f3607be07d7baafe615a79d7d30ab73d6eaddd263d955b55949271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F4 16244 bytes

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