Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7831f86669fb36e…

MALICIOUS

PDF

46.3 KB Created: 2020-08-06 15:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 426a472f8c00b5f69c0a1076cfc85926 SHA-1: b9688c90cdb0ebd45175880afafceba48f89dc68 SHA-256: a7831f86669fb36eddb932ce6a27fd2c2403d8f81ab661b89bc5dd1ba177c1bb
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to a known malicious redirector, specifically 'https://ttraff.cc/pify?keyword=expanding+tactics+for+listening+third+edition+answer+key+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure under the guise of providing a textbook answer key. No scripts were extracted from this sample.

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=expanding+tactics+for+listening+third+edition+answer+key+pdf
    • http://bimuwek.cheytownlady.com/uploads/1/3/1/3/131380480/juxarebatus-dirorobuzatowug-nibazagu.pdf
    • http://files.finncantaxidermy.com/uploads/1/3/1/3/131380052/tiwar-lozazaxaral.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://files.altadenaappliancrepairpro.com/uploads/1/3/1/4/131437711/5733391.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/nodolepomofemawabibuzebix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/27241030889.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/72839333780.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/disulufeboso.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/xesujagoxiravodamoxot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/dagibitobab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/53393174996.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/zagupakonexisedabik.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/perebikakifagugetovimipe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb2.bin
3a5779b41dcb29decb799155688ae7c9cf0c069bf0c9d0979c313e90f6aad8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB2 5700 bytes
font_01_sfnt_off0000733d.bin
245f3359f1946b5c4e02327e60b856b7992ce3cb710d520a2cfcf704a1a1cb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733D 10224 bytes
font_02_sfnt_off0000967e.bin
cb34041077e0012f033208b698ca59fa11ab5df6128ae7d1e1018d12da93001b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967E 16132 bytes

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