Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d5358d9541a12c…

MALICIOUS

PDF

36.8 KB Created: 2020-08-20 20:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43369f89cf16ed522a91cd465cd981f0 SHA-1: c35b45e39ca09ec97a6e4de21f87172636fae746 SHA-256: b5d5358d9541a12c72503b08a20fcea996d78563ed4291a8b4cf3aee5ff2ca45
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. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains the URL for the redirector and several other URLs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. 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=longman+advanced+english+dictionary+free
    • http://mizezaj.1posc.org/uploads/1/3/1/4/131406744/givinapewososofef.pdf
    • http://lugaduku.coho58.org/uploads/1/3/2/7/132740214/662a2b6b8487bc.pdf
    • http://pusipaja.stjohnpreschools.com/uploads/1/3/1/1/131164250/gagufuxetitozemi.pdf
    • http://files.tiffanyphillipsrn.com/uploads/1/3/0/8/130874063/939e9614.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/pyrexia_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/5_kingdom_system_of_classification.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/83818079426.pdf
    • https://cdn.shopify.com/s/files/1/0431/1554/4737/files/us_history_timeline_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/nisenifepuda.pdf
    • https://cdn.shopify.com/s/files/1/0437/5560/2078/files/ruped.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/37221276792.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7189/files/sewotedanudafekajafatituj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/mibosedewubigid.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_off000051ce.bin
2a7c17210a2500fad76750e7a086ea79d4370bd2ffff9ab30bf38b7cbe2e059a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51CE 5540 bytes
font_01_sfnt_off00006481.bin
5434876a8fc09882906de6788079b6a0295255cd8f888f27b38308af59c30dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 9864 bytes

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