Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea1672a1deeb62e…

MALICIOUS

PDF

31.1 KB Created: 2020-09-06 08:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c85f7d43f53820135a8b0bde47341c2b SHA-1: 375fdb90f51c632623c9f235ec0f4c1fe89a6504 SHA-256: eea1672a1deeb62ea7e1cc3aba141c1309748f791b239ce559e600941e0064f3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious infrastructure. The document body, though heavily obfuscated, contains text related to worksheets and the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=synonyms+and+antonyms+worksheets+grade+8+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7752/3861/files/80s_neon_font.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/hernia_de_disco_cervical_fisioterapia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/91885481978.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ed64d2_62ab978cf86d46e89822219017e46ebc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2e20a_b2d064c1cffd49a989c870628ef41ff0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b1b16e_559dd9b30ef647cb87dac8bd96ff6d7a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3f496e21c71f4133bbef8f40766c2897.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3de8a6_ae20c730341645e9b6c112273436a80f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/2404/7269/files/lowercase_letter_l_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/alanganallur_jallikattu_2017_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/aes_encryption_files.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/julosujedexibewuvegu.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/221f3a_bdb12bf8e9bd4cc5af39cb3af6d09f57.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/65b209_4d33e5af0edf4fd88c243c29e23c0494.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/430cb2_22b98803928d4c3482e49665d21b77ef.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 5976 bytes
SHA-256: dbad07539ef53728919a826d6686a24ead7868be1eb50a4d7bf1ae79116a3994