Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fef347f4304b550…

MALICIOUS

PDF

48.1 KB Created: 2020-08-10 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73393f64efb3c9ebf11434156e6743c SHA-1: faf2c9ce37cceecfb287e8e713f96cc5e194ba86 SHA-256: 6fef347f4304b5503c36822c8bd68d1675a02652bc03a9fd6f853c43b0589986
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as a free book download. This suggests a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment. No scripts were extracted, but the document's structure and embedded links are indicative of a malicious lure.

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/pify?keyword=story+central+1+student+book+pdf+free+download
    • http://files.voxnsccp.com/uploads/1/3/0/7/130775346/ca8b4a89.pdf
    • http://files.studioaase.ca/uploads/1/3/1/3/131381428/1939022.pdf
    • http://files.sweetmaplecafe.co/uploads/1/3/1/4/131407901/laradurewezenagaxigu.pdf
    • http://files.cathywmsart.com/uploads/1/3/1/3/131398085/34e650aa9d0f6.pdf
    • http://files.thebellhouse.info/uploads/1/3/0/8/130814900/d51f92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13503036424.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/dubawibuborulisububizegom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/neraluribup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/tudisujalabemaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/mikobiperubigopejez.pdf
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/2400521947.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/nirutifotekolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7288/8742/files/php_json_response.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/harbor_freight_router_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rexalomofovuwazeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/87923705019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/rosidoromodomexisawap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/94061295363.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c6f.bin
2dcdbcf8c2cc57ac8287ef1c3d323266b5d736ff959cb6f0e57149983c409cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6F 5536 bytes
font_01_sfnt_off00007f5a.bin
8af64813047a6c0fd708c6450131dc7f98aeb152c6c862ed620a181fb09547d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5A 11756 bytes
font_02_sfnt_off0000a50f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50F 4324 bytes

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