Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57b51746a34fad2…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 08:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ab20f7f5708c5c7c1ecf98d50f16e7 SHA-1: 2ebf87d84db285b3206a09a56ca3e8afb20cac4c SHA-256: b57b51746a34fad251a42ac5bdec8790f0a0b5b635ceebe29894340204978007
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.club/wix?keyword=hello+world+react+app'. Another heuristic detected a large PDF link farm, with many links pointing to Shopify-hosted PDFs. The document body, though heavily obfuscated, also contains the malicious redirector URL. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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.club/wix?keyword=hello+world+react+app
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/miwewametiduzugudugobuwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/verbal_ability_cat_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/diferencias_entre_auditoria_interna_y_externa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9209/0788/files/porsche_944_buyers_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/5266794568.pdf
    • https://static.usrfiles.com/ugd/b8c837_97bb5a741a0e419a82bba4f1c117ca3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_68c449a8f5514fd8bdec4b1be8db192b.pdf
    • https://static.usrfiles.com/ugd/fb83f1_8a7aef00cd6b4e77b9f18591ea7764c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5c930cd192341068dc5cb433cd6616b.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_b7d0cd7d788842b58ec1bbfbedbdf1a3.pdf
    • https://static.usrfiles.com/ugd/4117a9_4f170738d8d34145a355707a7d14024c.pdf
    • https://static.usrfiles.com/ugd/3fc21f_98ca96ae622246d89fd5655bdb867de4.pdf
    • https://static.usrfiles.com/ugd/66c878_3ca7c88488f240fa80dd9285ef6626ef.pdf
    • https://static.usrfiles.com/ugd/162fe6_9c14c17e81534aad9380b1501f157960.pdf
    • https://static.usrfiles.com/ugd/8b9728_4912cdd453e5414bb7f637841ab5f95d.pdf
    • https://static.usrfiles.com/ugd/b8c837_045c7a683e3b4c32bcab05f62dbaa407.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_off00006259.bin
f5ddaee9782fc3f9f80078db0d279441f02ca04656f250774f7f16e1db64aa56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 4940 bytes
font_01_sfnt_off00007341.bin
6d911d7a926aa272374678c22782968111cb13b89c81af9348d323ed5445652e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7341 10400 bytes

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