Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f93cd33643d0f1…

MALICIOUS

PDF

41.5 KB Created: 2020-09-10 13:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 501630e6980c58636086fd9a397e56c9 SHA-1: b1da882cbad8173c61b3f5744a60f8a8aa7fd350 SHA-256: 81f93cd33643d0f135ea00be8f6c9f75c95548b92f56a2b48389b12132deb8ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Factorio guide crude oil' and the URL 'https://ttraff.me/wix?keyword=factorio+guide+crude+oil', suggesting a lure to disguise malicious activity. The presence of a large number of external PDF links further supports the classification as a link farm designed to redirect users to 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.me/wix?keyword=factorio+guide+crude+oil
    • http://files.juliebwiest.com/uploads/1/3/1/4/131407742/607112.pdf
    • http://files.ashleyskinnertherapy.com/uploads/1/3/1/3/131383325/sikirulogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1f5cef_1d9c9118fb7745478ae235df248a788d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0ebfcabce4c4cf0a162a5a8fcf1f344.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_7dbb7cc8bd754b96b7eaffec91c3bced.pdf
    • https://static.usrfiles.com/ugd/3e87bf_a5840c5df9f84c698b64930200ff9b29.pdf
    • https://static.usrfiles.com/ugd/32acb1_8dff7e53e2464543a8fa815f87c2b81a.pdf
    • https://static.usrfiles.com/ugd/5ecadc_fb111b0cc250412990b283382b4e621f.pdf
    • https://static.usrfiles.com/ugd/6c8f37_c4a314bc6e9f41909dfbdc57b04a769b.pdf
    • https://static.usrfiles.com/ugd/5f226e_e5e298510bfc42208fc52e59ea85a20c.pdf
    • https://static.usrfiles.com/ugd/c81504_1ab2d294e54b4a418f6bf0e87c62f941.pdf
    • https://static.usrfiles.com/ugd/affb4a_0cf03c7c501948649fc89876991f7aa4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/ssc_answer_sheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/tasexewabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8086/7239/files/kasofumixojipedesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/dukab.pdf
    • https://cdn.shopify.com/s/files/1/0458/0881/2198/files/79687011402.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ac.bin
9e7415df584dd5a8380b3ea0bb91f7ce73dcbec26a0182424b5da6729e1c302f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AC 4884 bytes
font_01_sfnt_off00007856.bin
77a0348cac1378d62ff0034c2470ed7d4080e68ee29f287e2b43f13f3a796a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7856 9672 bytes

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