Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91e7e7e45307000…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 04:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3b6efba2604723e139caa987693aba3 SHA-1: 788320c88435f7b1dbae707db6cbab3283666b55 SHA-256: b91e7e7e453070005b53c30d155b375033771b6a866958067faba0dbfef51ef9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of this redirection scheme. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to lead users to harmful content.

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.com/pify?keyword=ecocardiografia+tridimensional+pdf
    • http://files.buffalorutlandcompany.com/uploads/1/3/2/6/132683267/621b1ad.pdf
    • http://vunegoxa.fenceposttrading.com/uploads/1/3/0/8/130874524/pegexa-ribewowomezas-jezademalowi-gupidulanab.pdf
    • http://files.zhuangguo94.com/uploads/1/3/1/6/131637372/2998644.pdf
    • http://files.janezellmusic.com/uploads/1/3/1/4/131483275/lirejibivifoz.pdf
    • http://files.waysideresources.com/uploads/1/3/1/4/131407687/nonelosovabimo-gotolax.pdf
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/posexenadetawarezigopavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/regevozuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0181/files/pixubapemulozereripax.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/69544622339.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/kafemaduwopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/install_anaconda_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/vekifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/83500160870.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/abraham_maslow_hierarchy_of_needs_summary.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/rexikuwofevirataw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/fotavikupexiwumetuz.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_off0000656c.bin
fa47d64f32294e75c4b2f1cb22b0f0f1c60bebe9f4d62e9378beeb17e1576a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656C 5432 bytes
font_01_sfnt_off000077dd.bin
fa95e7fb19d368c23934ee7ead7b8151f70545dca1bf76a95d2869e97bd47e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DD 14116 bytes

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