Malicious PDF — malware analysis report

Static analysis result for SHA-256 507c8442bceb9348…

MALICIOUS

PDF

58.1 KB Created: 2020-08-23 03:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a914741bad970776039d9709ab34c0 SHA-1: 14a923b8f501c894fa67c6ec5e4fcc01c1fc3d7f SHA-256: 507c8442bceb9348f50a8b03f7fc433adea13f1dd400b33944b2e5767324d73b
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, identified by the 'ttraff.cc' domain, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this same malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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=associative+property+of+addition+worksheet
    • http://files.stephartist.com/uploads/1/3/1/4/131406149/nasenasu.pdf
    • http://gegapavi.unibross.com/uploads/1/3/1/6/131606569/wexorepofamok-faliditozi-kapugakuvat-zoreteg.pdf
    • http://zumuzisu.cphcoffee.com/uploads/1/3/1/3/131379326/fd71c877.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/loliburafibuzeneg.pdf
    • https://cdn.shopify.com/s/files/1/0435/0184/6692/files/21430335392.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/voxame.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/tunugupimiwewogevivesag.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/nucleo_funcion_y_estructura.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/22327033473.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/60299181036.pdf
    • https://cdn.shopify.com/s/files/1/0428/4284/9446/files/11275798207.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/74332394824.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/jafegifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/27832361760.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/foods_to_avoid_for_kidney_stones.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/74576153975.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/zelowati.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_off0000a436.bin
fa3682738520837875a27e01ca7c3e1ba13f2c6f97670b6fa01f51cc7aa1f9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA436 5520 bytes
font_01_sfnt_off0000b712.bin
21ee34120738966ab9c33d086759b3c3258553853ccd2fe92bf4e4745190a1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB712 10564 bytes

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