Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b5d1bb95df2d95…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 13:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e04642f61990ecedd4abb1b28b4b3b SHA-1: 7383848852b01f8579df1029573ca70768963f36 SHA-256: 11b5d1bb95df2d9509618d6d6dc31561c84c5c33c4cc5209c45b2fd1d581141e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a 'self certification form 2019 pdf'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The ML classifier strongly indicates maliciousness, and the embedded URL is a primary indicator of a phishing or redirection attempt.

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=self+certification+form+2019+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_916e44f6fad5480fa1539ac33117e80c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ab25414c9c64c709e10baf17f97e10b.pdf
    • https://static.usrfiles.com/ugd/b8c837_abb20bad16374a96ba6a072e9a25c470.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b453d6624434715a0b99af8679feebe.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bf73c9469a149e29844297101e16ec4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/16265322720.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/73414235151.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/cb_insights_fintech_report_q1_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/64759615539.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/wegasaleretadixij.pdf
    • https://cdn.shopify.com/s/files/1/0460/2570/3583/files/11274243979.pdf
    • https://cdn.shopify.com/s/files/1/0443/0177/9100/files/vomutodarozakasatubasit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/xafalizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/momavuluregulole.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/27818578559.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005743.bin
191029873d7dd94f2f610ca66ca67a6442d9a921c8016df59dc8d3bcddf6d86c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5743 5708 bytes
font_01_sfnt_off00006a90.bin
f28b41563805f1d4b9501b25dfc84306ce4f68f9081318fd50c3fcd36b532b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A90 10040 bytes