Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b65293a5577c5c…

MALICIOUS

PDF

46.6 KB Created: 2020-09-06 10:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d9cf45f71a154688d767a3e2a24988 SHA-1: 6f7bef1f86f68e2a9b882eeaa5e7948c259fa656 SHA-256: 21b65293a5577c5c6edb9c676f72202f7d00ad11a9fd212d388ad23036b442fe
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious link points to a redirector, suggesting an attempt to obscure the final destination. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious operation, likely for SEO abuse or to distribute further 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.link/wix?keyword=template+argument+c%252B%252B
    • https://static.usrfiles.com/ugd/1decf9_5b8cf68b3de74c3b8ac5e24151f9b5da.pdf
    • https://static.usrfiles.com/ugd/be19e1_d1c6c1f8ab1e4ad6af372aab30b3a289.pdf
    • https://static.usrfiles.com/ugd/e73fea_7ad20e27c7094de5a2b6495f4171e085.pdf
    • https://static.usrfiles.com/ugd/de65f7_3d5dd38b07aa4665b0169164cca7d97f.pdf
    • https://static.usrfiles.com/ugd/e6092c_f1dee630f34f4cc1ab87043f80b0e751.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6709bc75bdb48f1aad4cab8ec6c77ee.pdf
    • https://static.usrfiles.com/ugd/136d07_f194ec128d844b34abb69a8ac64fe071.pdf
    • https://static.usrfiles.com/ugd/15d534_9135d079cd644236921c68b8ffbfdf9e.pdf
    • https://static.usrfiles.com/ugd/f67134_3fff30f0a0a14749ade06c2d869309b6.pdf
    • https://cdn.shopify.com/s/files/1/0429/7654/2873/files/48627870573.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/shakespeare_plays_in_order_of_performance.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/kazowa.pdf
    • https://cdn.shopify.com/s/files/1/0463/0491/9712/files/neoplasia_hepatica.pdf
    • https://static.usrfiles.com/ugd/bbd3cf_6cfbda6bf1c84f3498718ec3f6ef6971.pdf
    • https://static.usrfiles.com/ugd/1e533a_f973e0acbff5458e93bec97ded9a2f8e.pdf
    • https://static.usrfiles.com/ugd/ed64d2_a9a5042700f84bef827742444a367837.pdf
    • https://static.usrfiles.com/ugd/cbe325_aa0fef5dacec4951b40b3a00227af32f.pdf
    • https://static.usrfiles.com/ugd/f0f215_56dbbea192e4462a869e89a2d1136db2.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_off000070db.bin
21454a26298cfab860d9781fdb9985b7086e09fd1ef9329010ba917a6fbb3233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DB 5024 bytes
font_01_sfnt_off000081d8.bin
7560670370ca6e50ad74eccb7e12d10c3cfa3ad4e9bc811161b11ac2fd937dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 13820 bytes

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