Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5acbdeeafa6ecf…

MALICIOUS

PDF

34.2 KB Created: 2020-08-24 13:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3da3af92b949d86af1c9917b1e5da88 SHA-1: ca2d2e513241786f5a54cdb17b8c0d384122c49f SHA-256: df5acbdeeafa6ecfcbbe3ef13f2ba0f93fa9b691cc1356fb8a052639e298bea9
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and text related to sheet music, suggesting a lure. The PDF also contains a large number of links to Shopify-hosted PDFs, indicating a link farm designed for SEO manipulation, likely to improve the ranking of the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=speak+softly+love+sheet+music+free
    • http://files.lenagregory.com/uploads/1/3/1/3/131383325/4977625.pdf
    • http://files.themelodyofme.com/uploads/1/3/2/6/132682899/9fec9.pdf
    • http://zamiwabo.tipsyglasswinery.com/uploads/1/3/2/7/132740829/4b7cb0f7ddc829a.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/total_war_rome_2_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/fixifoxemibemumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/39283249908.pdf
    • https://cdn.shopify.com/s/files/1/0433/2430/9659/files/squeeze_theorem_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/36908565658.pdf
    • https://cdn.shopify.com/s/files/1/0462/9345/0913/files/differentiation_worksheet_as_level.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/inestabilidad_atlantoaxoidea.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1063/files/aprender_kanjis_japoneses.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/pastel_purple_formal_dress.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/73610087313.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_off00004637.bin
c0ceda0308ef175ba208c6ce9eb8078ed304db2b835acc895bb05ada275f2cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4637 5584 bytes
font_01_sfnt_off00005919.bin
aed92dad351939fb49976d1120f1ef7b3b4d5a6e74aee44f422dfdd2654ef229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5919 10228 bytes

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