Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8340193f3efc8a…

MALICIOUS

PDF

52.6 KB Created: 2020-08-19 20:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0759e696b3d30445f84e69053645306c SHA-1: 1d7ae8e7ee8c3a8ffc8c2b8b27b5f38fe2036d17 SHA-256: 8f8340193f3efc8ac821a9c3573931e82c0e751e674b3d5a04f615dd81cd0be4
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a coordinated effort to distribute malicious content or conduct phishing. The ML classifier strongly supports the malicious nature of the PDF. The presence of a link farm and a malicious redirector indicates a likely phishing or malware distribution attack.

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=boboiboy+2+the+movie
    • http://makesu.writerswhorun.com/uploads/1/3/1/4/131407089/5e427390511d9f0.pdf
    • http://files.pandorasyarn.com/uploads/1/3/0/8/130815017/zezaje_nipofuvujiroza.pdf
    • https://cdn.shopify.com/s/files/1/0432/8793/7179/files/gofafatabox.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/38316882757.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2807/files/87263773030.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/civil_rights_movement_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/2901/1359/files/negative_feedback_after_interview_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/zarenemazomofosakoxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/5493052855.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/database_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/buguvodubiwibaranu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6942/files/fazuror.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/10984622143.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_off00007b5e.bin
a8a297f76675d9bac6f6eb39984b9095aa8acf91bf528f6fd91667b32572ab3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5E 4892 bytes
font_01_sfnt_off00008bfb.bin
e22aa552fff0fadd8a3f14dfe7b3848e0678b224ec34f58d08775c6722d46f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFB 11084 bytes
font_02_sfnt_off0000b12a.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 16036 bytes

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