Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a93c1b0e6a3c2e…

MALICIOUS

PDF

44.4 KB Created: 2020-09-02 18:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d53217027c65dccde17ecce84db1d6 SHA-1: 8e7ab16874c1a2c3c5b2c64639fa9975aac19b09 SHA-256: d5a93c1b0e6a3c2e0f1c7a797bd5d78736fa2a53cad86bcaeffd529ef946dc7e
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a malicious destination. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links.

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.me/wix?keyword=surf+report+coronado+beach+san+diego
    • https://static.usrfiles.com/ugd/b8c837_ec6dc4abfed24e0485d191fad560d80a.pdf
    • https://static.usrfiles.com/ugd/67e251_8180c237f60c49a5abe40ff443c5997d.pdf
    • https://static.usrfiles.com/ugd/105a8c_69071acb8133481c9083ba0d4d87ea02.pdf
    • https://static.usrfiles.com/ugd/c1de29_b7dd0310f9e142b6b1e2938990c4e00c.pdf
    • https://static.usrfiles.com/ugd/2e79a6_b235862f93f14a5b960ab1ac4141513a.pdf
    • https://cdn.shopify.com/s/files/1/0434/7805/7122/files/gitedawajibikumolagen.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/suzuki_violin_volume_3_piano_accompaniment.pdf
    • https://static.usrfiles.com/ugd/07625c_e26d8895e19f4268bda822deeb20147d.pdf
    • https://static.usrfiles.com/ugd/b8c837_82dbe24541994cccb731040fab8ba8dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f38b2a135cc4e28abec2c076ae10372.pdf
    • https://static.usrfiles.com/ugd/e66789_71c0612e476540f3bdfb1bd1fe9f3f88.pdf
    • https://static.usrfiles.com/ugd/ab059d_730b30c6f1cb4544a4b1d27085f1a08a.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/wapadugugebevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/kualitas_sumber_daya_manusia_di_indonesia.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/
    • https://static.usrfiles.com/ugd/b8c837_82dbe24541994cccb731040fab8ba8dc

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b8.bin
a1ac4f26c0f1e34878550a618305316afadf985e5d1d5eaeca20a8e6545d9f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 5628 bytes
font_01_sfnt_off00007ad0.bin
6b5878dce4f9260a383954ee32b21c14eafa7af122c93f89b9b7267136698b44
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD0 13740 bytes