Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f22d2e0ce59eac6…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 19:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbe3896ab71addfad9af641dda85859 SHA-1: 2a73d61b813d56193afbee365331d29d0d860661 SHA-256: 1f22d2e0ce59eac692dbd7597584de578d84d080682ff197b63989f46609364e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link is https://ttraff.cc/wix?keyword=everybody+writes+strategy, which is likely intended to lead the user to further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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/wix?keyword=everybody+writes+strategy
    • https://static.usrfiles.com/ugd/b8c837_019096de12f24e95a47cbc0fdde67012.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d310fa013448ffb91548e2e9a5dae6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5fbfa1ed3534f7a8e1d52aeb59ae180.pdf
    • https://static.usrfiles.com/ugd/b8c837_76aad2d728b14300a16c97fce72db967.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
    • https://static.usrfiles.com/ugd/b8c837_a549923e13cf4248b8a2f4a604685c78.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fbb7c673101445893d7852fea85c092.pdf
    • https://static.usrfiles.com/ugd/b8c837_591654e411f94a9eab90d94087a75b17.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/59458520141.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/54750537118.pdf
    • https://cdn.shopify.com/s/files/1/0464/9435/1512/files/uk_border_agency_reporting_centre.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/ramego.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/14953230617.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/unity_2d_rotate_object_towards_mouse.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/apnea_obstructiva_del_sueo_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0436/2511/9904/files/idaho_state_trooper_accident_reports.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/aplasia_medular_post_quimioterapia.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_off000066bb.bin
ad580b7f62f4b8109126acd6d0551dbd73123b21eb2a5d812a63d72854bb9a6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BB 5312 bytes
font_01_sfnt_off000078ee.bin
8e806ccf01c082e20d65b2d6586e799618fe4b9004d5102a81e0924784398c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 9916 bytes

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