Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c649b45a3983dc…

MALICIOUS

PDF

40.1 KB Created: 2020-09-06 20:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a54ced05f49580cb1f44ded90fc74fa7 SHA-1: 20ecb048798c720e0bb4d494080e2a313c3b2466 SHA-256: 43c649b45a3983dcefb69bd4e0adf2c5a79a363443d049fd42d9ee0f171df983
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including a suspicious redirector link and numerous links to PDFs hosted on Shopify and usrfiles.com. The primary malicious intent appears to be directing users to potentially harmful external sites through a large number of links.

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.link/wix?keyword=arbaaz+khan+song
    • https://cdn.shopify.com/s/files/1/0433/9885/6867/files/lasetasefunimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/tevoradetefetomele.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/21627422578.pdf
    • https://static.usrfiles.com/ugd/be19e1_22e32d21da1847e992f6d398827487e8.pdf
    • https://static.usrfiles.com/ugd/67f5f7_688b13f1843444aaa722016413e96700.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a83b0ded17144df8f748b470081d58e.pdf
    • https://static.usrfiles.com/ugd/cc1a03_fc041dc5bd71479c9449b2719869e5af.pdf
    • https://static.usrfiles.com/ugd/79e5df_f6d98141f91049e5872445ea45b7b167.pdf
    • https://static.usrfiles.com/ugd/921909_01ad2c48ef734d9d8c33e8941245a146.pdf
    • https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
    • https://static.usrfiles.com/ugd/733c1f_0e81fc58af724f31aef8c8a46cd20968.pdf
    • https://static.usrfiles.com/ugd/f65518_b8b50dec47ea4df0bc6043787ed47b10.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_off00005f41.bin
b57f13032fe98bbe89e94dea2fde7611ab3430f5d2e12d5723463a9b779e05f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 5160 bytes
font_01_sfnt_off000070d2.bin
239346137dec2ca19146944eedb73f8aa1b2a61c75174896526f4f1ab746d38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D2 10388 bytes

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