Malicious PDF — malware analysis report

Static analysis result for SHA-256 494bf5600c453fbd…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 04:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37217c821928e200af28f263ed9d92e SHA-1: 9c395c07d745f651109c30b8e052e80382ada0aa SHA-256: 494bf5600c453fbd039978b7535fc4e9c892c977c54c48f95c856fa9d55889e5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and references a PDF download. The ML classifier also strongly flagged this PDF as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning to drive traffic to the malicious redirector.

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.ru/wix?keyword=traveller+5+pdf+download
    • https://cdn.shopify.com/s/files/1/0428/9947/2551/files/aprendizaje_definicion_autores.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0437/0304/2216/files/63177197334.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/15480213266.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/ziworipuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4276/7001/files/41287229386.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/78162646699.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/lugetesiwijamapetogosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/67353332374.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/mexaxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0430/1688/0281/files/o_que__capitalismo_primeiros_passos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/broken_glass_arthur_miller.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/53102733650.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/62494180989.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_off000071ae.bin
b3a5ed90774074b1e30315ac6a23cc4a706421642d7b6b6b32599a4e938fcc73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AE 4740 bytes
font_01_sfnt_off000081f0.bin
d476ec6c9f5b8744045072b97920690b7b0075fa11f4d0c47108590e0231773f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 10616 bytes
font_02_sfnt_off0000a611.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA611 4324 bytes

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