Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12f0a9a3a45362d…

MALICIOUS

PDF

41.9 KB Created: 2020-07-27 08:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea389ee5618cce5dc4e0335ffb29b368 SHA-1: 9782c42e07bbbb2063e885aafbb27bc2b84db00f SHA-256: a12f0a9a3a45362da3e6ca79d5ec53260cb41426caa015cab4663cbe588f03ea
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'. Additionally, it exhibits a PDF SEO link farm behavior, with numerous links to external PDFs hosted on 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the redirector link and link farm indicates an attempt to lure users to malicious sites.

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/pify?keyword=flowerfell+secret+garden+sheet+music
    • http://files.melaniejacob.com/uploads/1/3/0/7/130775800/jidorixadasugijezupi.pdf
    • http://files.isiscommunitytheatre.com/uploads/1/3/1/4/131438682/nodofurixug.pdf
    • http://files.aplacecalledroam.com/uploads/1/3/2/7/132710748/361792.pdf
    • http://files.basisscottsdaleboosters.org/uploads/1/3/1/4/131453753/xepafomig_nolexonozakopo_bidita_vedafumemawo.pdf
    • http://files.steveneillsgarage.com/uploads/1/3/0/8/130874123/6e8a6d2184c3eb2.pdf
    • http://files.aplacecalledroam.com/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/60898822949.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/kurodud.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/23282119243.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/94926173947.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2320/files/17095326786.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejut.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/33517062086.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/xorejefenitowegagot.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/71185285534.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/32500574425.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/xikifafer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.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_off00005b89.bin
23e493342af522ec419e78b349d46e56b70cb0cc5cce161d815926e2725beb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B89 5364 bytes
font_01_sfnt_off00006da6.bin
5fbb1070785fcb5b3791e421e4fa609bf17ff3a708c27154714420e785f657ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 13448 bytes

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