Malicious PDF — malware analysis report

Static analysis result for SHA-256 950686622f14fc53…

MALICIOUS

PDF

33.4 KB Created: 2020-08-30 09:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ea8543edf69029ab2d6c6eb0f47d73b SHA-1: 47e78ce1bd7c9593496eef0e240c09c5bb9132ea SHA-256: 950686622f14fc53f2c842de02cbe6a9b849f0bdc71aa9f86ccc7f73d7538bd4
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body contains obfuscated text and multiple URLs, including the primary malicious redirector and numerous benign-looking Shopify links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=everstart+maxx+k05
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/95530918231.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0447/0757/8009/files/xutilidufosinate.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18410569865.pdf
    • https://cdn.shopify.com/s/files/1/0454/0373/4184/files/47372385734.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/gonodiwubibijebiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/video_from_website_mac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee9db509fe3b41b8b98ae1688667e26e.pdf
    • https://static.usrfiles.com/ugd/97634b_c12bbae26fc0452ea39af81854ac24c0.pdf
    • https://static.usrfiles.com/ugd/d54300_2a34152714644af28ce5ecd4e3d99f3d.pdf
    • https://static.usrfiles.com/ugd/89064d_e3d557dc276b45bf9723674e3c4d6c93.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/zumepamirelusamifamokid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/18788253124.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/24405501565.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/aditya_hrudayam_stotram_in_marathi.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_off00004618.bin
f7292ade2d34dae88f3ed84a278906ad7ed9d8052f40c379880b84a3de9faf14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4618 5212 bytes
font_01_sfnt_off000057c3.bin
099fe6d7c0beb83cb08d81d30cafc13190298084078285a964129d026ff73769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57C3 9852 bytes

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