Malicious PDF — malware analysis report

Static analysis result for SHA-256 6724918f633050a2…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 03:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67758ffb4353ca98c99c00d7b614cdb SHA-1: 0808ba8ffa0be379767be8ffbd8ef15a75eece9e SHA-256: 6724918f633050a29db44fc5511d81d1ccaa3882479e278316f941e56fcce6c3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for free PDF downloads, likely a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=essentials+of+lifespan+development+5th+edition+free+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/48d9a1_04e805e527ed4dfcb08cd36cb78e29d7.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_f92217a88313410c93ea02616bb24dea.pdf
    • https://static.usrfiles.com/ugd/d55797_11b249d291d3401eb82eeca7730da94b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b91d50b68614c46803039793415de73.pdf
    • https://static.usrfiles.com/ugd/eaf48f_4944a5a4b89c44a2b5de8aceb79c6b9f.pdf
    • https://static.usrfiles.com/ugd/5af86b_655a7c2f0ceb4ac29abe0d378a04deea.pdf
    • https://static.usrfiles.com/ugd/b8c837_b607107cf63647d0ad80df8d885d491b.pdf
    • https://static.usrfiles.com/ugd/be19e1_bc96f524fec54426a7c2e2d24b38c240.pdf
    • https://static.usrfiles.com/ugd/b88e3d_9e7ed59b4f6a4cf9a647a50c7d87c879.pdf
    • https://static.usrfiles.com/ugd/097bd5_ca601c1d565342a5a984a84e688b58fa.pdf
    • https://static.usrfiles.com/ugd/e3ff21_2adba6bf0b574f218684176aefe6ddd0.pdf
    • https://static.usrfiles.com/ugd/fd30ac_fd80a59dd33a44c9ac07f8ce8580131e.pdf
    • https://static.usrfiles.com/ugd/599f1c_1463dda8f5474ff1b35bab2c0e109b1c.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_off000071d7.bin
6581b6abef0aa1d6bd059eeed60b859f90b5a23ec851542b0474af1e7e60dc0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D7 5420 bytes
font_01_sfnt_off00008425.bin
2a0b7186cb6bbb11eb6005c9d873b27dde7adf183178eedea54edd455545fddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8425 10784 bytes