Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c461c48bba883ee…

MALICIOUS

PDF

40.1 KB Created: 2020-09-01 04:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc72937f8c9b8759a2119f1355d86b50 SHA-1: 214c0eb0c3562440a03f378a0592546ed749bd97 SHA-256: 0c461c48bba883ee10d04f7b7340a1d125d25a7ac6831866b091918780c4eeda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, however, directs to 'ttraff.com', identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'properties of 2d shapes year 6 worksheet', indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=properties+of+2d+shapes+year+6+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/90340808292.pdf
    • https://cdn.shopify.com/s/files/1/0428/7299/5996/files/jerevopiluxuviluvani.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/literature_review_on_chrysophyllum_albidum.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/82905472121.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/86959237030.pdf
    • https://cdn.shopify.com/s/files/1/0437/9436/6626/files/medepuzapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/bsc_publication_money_banking_and_finance.pdf
    • https://static.usrfiles.com/ugd/c3f88d_33a7f495c347470195c433b2a17a197b.pdf
    • https://static.usrfiles.com/ugd/4b874d_1d82b71997ab4fc3be84046b08cc1923.pdf
    • https://static.usrfiles.com/ugd/e5a943_f11ff7a15bcc42ebb1f11abc763ca0e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_469bdc7996e2437d98cc89df968115a4.pdf
    • https://static.usrfiles.com/ugd/04e6f9_da590815f1ad433b87a7b7ee6c83e800.pdf
    • https://static.usrfiles.com/ugd/b8c837_460d0313e2ff4da7bcfcd08254136c0b.pdf
    • https://static.usrfiles.com/ugd/1f5cef_7e6aa0c6094840e2a0a3776cd5bb5409.pdf
    • https://static.usrfiles.com/ugd/affaa6_b8fa76c30dfa414d9fb2dffd08b5376d.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_off00005d8b.bin
d4953828edd9757cfb30bde9f43bc9725edcc0c65f9fc0d00596b2662ad750f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8B 5644 bytes
font_01_sfnt_off000070da.bin
d29d32fd4a3b649b6481b1cbfdee5122b287d47d865da6b54eb734b38414fc9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10136 bytes