Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d3f08c5c88ce55…

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 21:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f34a426d2cfc8a92edf33e72fac9bcb SHA-1: 6e47fe2f43ec8537580f7f31f66400765eb9347e SHA-256: 95d3f08c5c88ce558e579b9fe746ecc1bc6f58353dc06bddeffd1bc1ce1be5db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, includes text suggesting it is a "bearing maths notes pdf" lure. The presence of numerous external PDF links, as flagged by PDF_SEO_LINK_FARM, indicates a likely attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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/pify?keyword=bearing+maths+notes+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/1/0434/0544/3233/files/11648970150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7384/4888/files/ruwitumobazegokibeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/bipimikorutudil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/warm_bodies_tamil_dubbed_movie_tamilrockers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9953/8087/files/33094560102.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/99afdc_62ab441e1af24ac4b3faa8f8dd791241.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9904c2_0057a15eb9a04fe0a26f27d89fdbc737.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/590778_999f87d6b12a4360aee186315940ed6f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a44510_5f095b052d0a4d5e976ddc818938437b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ad2ade_196b0ee44d40424c9a8ec7cdbe78f0a1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/8816/8358/files/ecg_test_report_check.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9980/6113/files/68816276467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/tegotaxepag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/80366628666.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4ff69_9e2bd43c32f5497fac2d20dd55f12807.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c345b0_d2f89f057cd64790999f9d416c92a20c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE2 5472 bytes
SHA-256: 5b2eca5c08a9664fb6b5c7de23b4e53df60ec3548a580c8efdeff05016cdba0e
font_01_sfnt_off00007058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7058 10052 bytes
SHA-256: e03812b81033fd2f8e52ac41dcc61f521c090e24bb7266b85ddd87f090b3181f
font_02_sfnt_off0000926f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x926F 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

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