Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb7b877db69b420…

MALICIOUS

PDF

94.5 KB Created: 2020-09-07 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b425e916c310cdf816f293c736e1c386 SHA-1: 3357f0c9c10813f9c610b4450ebee56197882293 SHA-256: efb7b877db69b420d9314e8f480bb31cee3e5d5a4a10de6754856f72df2fb64b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL designed to trick users into downloading content, disguised as music. The PDF also contains a large number of embedded links to Shopify domains, likely part of a link farm to improve SEO for malicious content.

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.link/wix?keyword=punjabi+bass+boosted+songs++320kbps
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/american_short_story_masterpieces.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/midedesedifitidikewerov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/49694942240.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/86411227385.pdf
    • https://cdn.shopify.com/s/files/1/0462/2440/8730/files/6471091299.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/gisipajixevapowezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.pdf
    • https://static.usrfiles.com/ugd/55e2c6_a1e26a017ad04d949be066ddef6364b1.pdf
    • https://static.usrfiles.com/ugd/880a7e_fa7bdc5dd98744d89dc1830c5e0692bd.pdf
    • https://cdn.shopify.com/s/files/1/0437/7378/8321/files/49519894745.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/96151818571.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/zuneponogijo.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/occupational_health_hazards_definition.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010701.bin
e5a3964f9c1122efb2798acf16ab2be78464c227567e1b6cf13f643739799b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 5600 bytes
font_01_sfnt_off00011a1a.bin
9f5febfcaad2ccd63e272956dfa8b71bda4afdad5c39428270cfd3397d926950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 10932 bytes
font_02_sfnt_off00013f76.bin
dabf0ccc451caf4864c9b22ca91318a92e8f625b469dd0561edf59b451c7a792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 18776 bytes
font_03_sfnt_off00015cdd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDD 4324 bytes

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