Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8af4bc7024c257c…

MALICIOUS

PDF

38.9 KB Created: 2020-09-01 14:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0103b4f1cb6bf8943c1001366e236135 SHA-1: a8480737c349f41bcefd32ea9998743d80e48064 SHA-256: e8af4bc7024c257c6db83b0bd5b46d04c581f18e6eaa6c3591dc321f0b2cc076
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics, specifically identifying it as a redirector link and a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=electrocardiography+essentials+pdf, which likely serves as a gateway to further malicious content. The document's structure suggests it's designed to host numerous links, aiming to exploit users through a variety of deceptive lures.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=electrocardiography+essentials+pdf
    • https://static.usrfiles.com/ugd/b8c837_9690b3e34f7743159963d5027f40e0e5.pdf
    • https://static.usrfiles.com/ugd/bfbc46_65f47ca9644a45ddbe6245500f21ee71.pdf
    • https://static.usrfiles.com/ugd/f6a907_6417eb48a8a24bec83940e41f53b926a.pdf
    • https://static.usrfiles.com/ugd/de65f7_f12aadd9c55b4c6cac3031f48fa72dd7.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_62a2d613154e415f9eec530e0c5b6bfc.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/jinoruzifumudamali.pdf
    • https://cdn.shopify.com/s/files/1/0435/3527/0039/files/narusuvovab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/jajasevurominiwutin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2961/0141/files/zunijelax.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/vuxuxufetenafexeterepo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/77957496285.pdf
    • https://static.usrfiles.com/ugd/b50c55_68ab5a2e698f45419a5c6224fef0d0df.pdf
    • https://static.usrfiles.com/ugd/e32576_d2fa961f9efc4a96bf8c4b64cc758405.pdf
    • https://static.usrfiles.com/ugd/921909_b2fd844381bf4c54849ab5c5dc15d6f5.pdf
    • https://static.usrfiles.com/ugd/91e123_d1817373e2ed41889a1dcd913eaa3961.pdf
    • https://static.usrfiles.com/ugd/23e9be_a67382b82fda4107ae1c8e34b852d1d3.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_off00005915.bin
b9e552c7f13ad1ac735ea43a5f7ac7bcc957360926e832fd747bc24013949408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5915 5476 bytes
font_01_sfnt_off00006bbf.bin
aac51228da0ece0d48220a1d8104525e2e32a04a425b08476a4ee2947dac74ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBF 10240 bytes

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