Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ceaa3f896d4e1fc…

MALICIOUS

PDF

59.2 KB Created: 2020-08-13 23:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0add7ac12fc2d39b0c0d6463646bd0 SHA-1: 4e870f25712df46cbfebcb410552668583f86f41 SHA-256: 2ceaa3f896d4e1fc569ef7068e24adab4396ff26d4a128e50afbb71f9b86e427
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, pointing to 'https://ttraff.cc/pify?keyword=photoshop+animation+file'. The document body, though heavily obfuscated, contains this URL and text suggesting a lure related to 'Photoshop animation file'. The presence of a large number of external PDF links, many hosted on shopify.com, indicates a link farm strategy, likely to improve SEO or distribute malicious content. The ML classifier also 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=photoshop+animation+file
    • http://files.romanglassbangles.com/uploads/1/3/1/8/131857494/469509b041.pdf
    • http://files.en.guacamaya.info/uploads/1/3/2/7/132740281/736524.pdf
    • http://files.pro-mx.com/uploads/1/3/0/9/130969656/8478804.pdf
    • http://files.timberriver.net/uploads/1/3/2/6/132680890/5a7667dedbb1.pdf
    • http://files.thesolidrockshop.com/uploads/1/3/0/8/130813797/zaxisufibuxuxigusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/borland_c_builder_6.pdf
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/71050101595.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/79501494620.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/goxanile.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3104/files/kernel_driver_not_installed_rc-_1908.pdf
    • https://cdn.shopify.com/s/files/1/0430/2081/2441/files/welch_s_t_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/8436/3416/files/baptist_distinctives.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/2099293699.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/93418378493.pdf
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/92083860339.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_off0000aae5.bin
b8c454a471b31e120f5a92d7df9fae5667f161563fa4e02466664f4e8ae3d616
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE5 5044 bytes
font_01_sfnt_off0000bbe2.bin
3f8087ce0100fe3d6f1761b40e6964c159419ac6d18d52961f70916ecd24b9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE2 10576 bytes