Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8756c571c78f2d5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 05:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4637d007cd5427c98c90be702ffaf45b SHA-1: a2671c99725d3f93684b3a66abdefbf3480c3b65 SHA-256: c8756c571c78f2d53aae27ce4d98f944e1866b4318fb4c1abaee74c6956bd5eb
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which likely serves as a lure for phishing or malware delivery. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=baa+baa+black+sheep+poem+pdf', indicating a direct attempt to redirect the user. The presence of numerous PDF links suggests a strategy to obscure the final malicious destination.

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=baa+baa+black+sheep+poem+pdf
    • http://files.yourhomeopathicsolution.com/uploads/1/3/1/4/131437307/kenededufi-rulorexujisegup-kigij.pdf
    • http://files.bloomingfulbirths.co.uk/uploads/1/3/0/9/130969371/4362299.pdf
    • http://files.tacomateasandherbs.com/uploads/1/3/0/8/130874431/05e8759a66575.pdf
    • http://gawumaro.counselingcentersofmichigan.com/uploads/1/3/1/4/131438405/3968836.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4081/files/tuwixutofuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/bepujofukon.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/59163685853.pdf
    • https://cdn.shopify.com/s/files/1/0438/2995/2674/files/87202309272.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/89891750642.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/jamugifomobaxin.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/nom_riesgos_psicosociales.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/39300195811.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/sisotemeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudogezemolajefenupil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/wanemapuzekuvo.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_off00006e2e.bin
1ba67d8491946fd0c7fbcafb0575d3db1c46bbeb7b29e482cedda815ceb29074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2E 5552 bytes
font_01_sfnt_off000080ec.bin
8453c6ce5c708085a812165a7ec54b474c99b7f8541d5cd2ee129d314eeb3fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 10240 bytes

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