Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6875a3eb5765c9…

MALICIOUS

PDF

41.5 KB Created: 2020-08-08 23:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba3b6c0cbd4f5c2ddb2537da12a88b2f SHA-1: 40f6ebffe0af4aac2c9f315153c44913cf042b6b SHA-256: 9f6875a3eb5765c92bc006a19073bd2795da663522feece65f68b316c317ad25
150 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=bonding+agents+in+dentistry+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links, with at least one leading to known malicious infrastructure.

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.cc/pify?keyword=bonding+agents+in+dentistry+pdf
    • http://files.nh-ahn.com/uploads/1/3/1/4/131410007/sewopaj_mulegonar_xuwojikuni_luwupufegutinal.pdf
    • http://navis.acds-clsa.com/uploads/1/3/1/6/131636612/6b74f6a33cc7.pdf
    • http://files.supremexjoy.com/uploads/1/3/1/8/131856476/7954450.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/forabegefedodesegerituno.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/precalculus_mathematics_for_calculus_7th_edition_etextbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/jivenimimamuwivavibise.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/87134682411.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/lefepamemebin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/76270720946.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/group_by_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3302/files/wonky_donkey_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/94139053324.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/caballo_viejo_partitura_trompeta.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_off00006435.bin
69658872815ce0a457019766d3f7240fb2fce37ae25060bc2c23cf8947261040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6435 5328 bytes
font_01_sfnt_off00007676.bin
7ac210e0a6762decd29933f5d798cc11d20ae2f5bef2bcd97ce5116a64b635e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7676 10240 bytes

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