Malicious PDF — malware analysis report

Static analysis result for SHA-256 79852f55ddfcf018…

MALICIOUS

PDF

39.1 KB Created: 2020-08-07 13:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba6c373baa21016b4aea06d754c661a5 SHA-1: 008121d0b193b034e0e2486b330df777bb27e8be SHA-256: 79852f55ddfcf018b4ac659a55cc4a4c54dd38aefc0c758e940c9543fa5e6bf2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a lesson plan, which leads to a link farm. The ML classifier strongly supports maliciousness. The primary IOC is the redirector URL, which is designed to obscure the ultimate destination. No scripts were extracted, limiting the analysis of direct execution.

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=semi+detailed+lesson+plan+in+english+grade+7+pdf
    • http://files.troyelementaryspanish.com/uploads/1/3/0/8/130874587/kidurasin_buvabe_rejadakozera_lokelimenuselam.pdf
    • http://files.impunity.site/uploads/1/3/2/6/132681204/lefopogi.pdf
    • http://merusoj.legsonwheels.com/uploads/1/3/1/4/131437812/762335.pdf
    • https://cdn.shopify.com/s/files/1/0432/2734/9159/files/gakefewopodekudusukiregi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/dekapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/41216120826.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/rogiloxagirasakopowugurel.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/22460334697.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/73097210065.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/mununepafawusupifokefawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/54525292280.pdf
    • https://cdn.shopify.com/s/files/1/0447/8078/1719/files/arrl_band_plan_chart.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/gunz_private_server.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/exercices_de_conjugaison_avoir_et_tre_au_prsent.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_off00005a71.bin
9f17d16a6e88d8f983b9be7a11b750d3c0dcb8832f4b3d795b29c4c84258845e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A71 5636 bytes
font_01_sfnt_off00006d75.bin
f2e9e9e476657d42448769f8b5aea200e1dc8110e760f11a265cb223c08e847a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 10008 bytes

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