Malicious PDF — malware analysis report

Static analysis result for SHA-256 953b8609e371d56f…

MALICIOUS

PDF

45.9 KB Created: 2020-07-29 07:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24fd81100b0fce35fa49ae67211a3ce1 SHA-1: 18157c94f68f229ef6d799368cbe1b119855525b SHA-256: 953b8609e371d56f0de3a2fd6c9c455b32f6feaf27d7d6c7c3fb14e2db84a361
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. This URL is presented with a deceptive keyword, 'edit pdf text in photoshop', likely to trick users into clicking. The PDF also contains a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=edit+pdf+text+in+photoshop
    • http://files.patmcculloughart.com/uploads/1/3/1/3/131380953/9532063.pdf
    • http://files.sghenchy.com/uploads/1/3/0/8/130874169/3215935.pdf
    • http://files.theprospike.com/uploads/1/3/2/8/132815318/1734324.pdf
    • http://files.triedandtruegranola.com/uploads/1/3/2/6/132681579/nefiwigamiw.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/24138671143.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/muwudakojasoxoxupubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6604/files/96738326452.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/nofaregagizemotumuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/86386502278.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2581/files/43023712677.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/renorasawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/jegakolivaxikizegexemeta.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/bomazanosusonuwusezini.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/52134327683.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/nolorizidowizavujaxu.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_off0000783c.bin
7926515081caba835bda96ba474a957fb0f962be313a503fc9ec69476007742e
pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 4604 bytes
font_01_sfnt_off000087e6.bin
f9b65eef3f38a9623d974653c1ebb2e30fcb6299eee15b7937695404923ed14d
pdf-font-stream PDF embedded font (sfnt) at offset 0x87E6 9968 bytes