Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ae1ddfc48d72b0…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 03:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9abde1f6fc8e50fb4324ad4544e72129 SHA-1: f52d04c9bea098bfb8d247a98c94dcd675e0162d SHA-256: f1ae1ddfc48d72b0170ca94571f799c22d96942b642a38020be4792e2f8895ac
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links, 'https://ttraff.me/wix?keyword=a+non+random+walk+down+wall+street', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to PDF files, reinforcing the link farm attack pattern. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=a+non+random+walk+down+wall+street
    • https://static.usrfiles.com/ugd/b8c837_39ae37403e9948c594754fe8ebdec814.pdf
    • https://static.usrfiles.com/ugd/b8c837_9021e0a4d19a420d9e7f540be05bb835.pdf
    • https://static.usrfiles.com/ugd/a771bd_f2b43a74c21f4078a483f22598d1bba3.pdf
    • https://static.usrfiles.com/ugd/a771bd_26da524b02864c528d99f140d84328b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c888e8bd03584673869bf0b0a5d6cd2f.pdf
    • https://static.usrfiles.com/ugd/a43ec6_2c2cab63ef5741859515318539e30369.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/black_panther_movie_2018_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/moonlight_sonata_3rd_movement_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/pusudelorixozivemerufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/23242392559.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c954b95b6f746faaf3d307c7670caea.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a21f5c85e794d8d9114d9f97d24ec2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4abdd563b084907801b7395f72b7dc4.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_off00006edc.bin
56a4265514be836f3b5e00504a1c68ce24f17f661158ff2abb68a28d325a3824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDC 5116 bytes
font_01_sfnt_off00008032.bin
90ad99ab37a966709290f661a2fc81ce84db4c108e4014b88369f08cb2b3ad05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 10388 bytes

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