Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c81406c2fda985…

MALICIOUS

PDF

39.0 KB Created: 2020-08-22 15:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a48578f39c0cbf55096a05b56eb9899 SHA-1: a3cc3a8bb795f066c11a9228006d270a0bbd0bcc SHA-256: d4c81406c2fda98584ed3a35723ae43e608703e9514fc55ed32223a5db85a4af
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the string "Zendesk guide theme code" and the malicious URL, suggesting a lure to a phishing or scam page. No scripts were extracted, limiting the analysis of direct payload execution.

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=zendesk+guide+theme+code
    • http://files.frankdrake.org/uploads/1/3/0/8/130873828/6045972.pdf
    • http://mefigapa.deckbuildersiowacity.com/uploads/1/3/2/7/132712380/2022738.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/49277590069.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/algorithme_pcime_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/93268437357.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/72844668921.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/vatuxikamuzajura.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/54330060354.pdf
    • https://cdn.shopify.com/s/files/1/0434/4722/2422/files/metenapazejejupatavukope.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/39886088856.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/46851032731.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_off00005b7a.bin
db0264bbb4468578ea22ad9c8fcf630f398a27cbb3e6af5977ad79e8c4ec5b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7A 5036 bytes
font_01_sfnt_off00006c7a.bin
c2a6415879216604f84d494c1b0be96d1e5a89a87ba80f8135adea5cb7c0f1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7A 10208 bytes

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