Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa3bda79b61f973…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 19:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45c7ccc41eccbc8483431b8bceca2be SHA-1: a0fedafff412f5d6d18e1cf59e82ee51eb2b1a49 SHA-256: 2aa3bda79b61f9736478aa8c2119baf9b88429ec64ff33efbf554cde39769f9c
152 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, designed to mimic search results for educational content. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.cc/wix?keyword=the+cask+of+amontillado+questions+sp`. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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.cc/wix?keyword=the+cask+of+amontillado+questions+sp
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/22571922024.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/33192713142.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/wofezapigowiruvuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/72879143537.pdf
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/54932666113.pdf
    • https://static.usrfiles.com/ugd/6df952_66e0f02da5474d10a3157843e871cd6b.pdf
    • https://static.usrfiles.com/ugd/e1d12c_f69e0e3bed4d4f10ae60b4050747cf07.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_6c7f203dfc704b7fb500750965040080.pdf
    • https://static.usrfiles.com/ugd/f515ca_b035a855a60c4eea9fa2dadb6e19bec8.pdf
    • https://static.usrfiles.com/ugd/cd79e3_a3f0773c5fb44ae3a4661c0067ea7348.pdf
    • https://static.usrfiles.com/ugd/b8c837_01997eb66f384cb2b5483b4ff4489c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_db9b540fbbe147f8a512187bec583164.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6580/files/78291046016.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/82867752697.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/69473349014.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/27956814799.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000598e.bin
f402a598bb21d082d09c4ee5f4cd291fe008785a73c7dcb4ca3c05f1692fb288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598E 5320 bytes
font_01_sfnt_off00006b7b.bin
80f3264f2b11c6109847135467cbf9f04485b6c50d3702373396bed5ba71fce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 9968 bytes
font_02_sfnt_off00008d3b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3B 4324 bytes

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