Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e7cca03c91d9c6…

MALICIOUS

PDF

55.0 KB Created: 2020-08-21 01:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ce601c9b918392b8d12210a6f78de0e SHA-1: 484c5147b40cdd7f2fd9e9db431f052746b9387e SHA-256: 17e7cca03c91d9c6ed9a0eb20d0726d8008cece064e199aef2caa59b71b14f63
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 infrastructure, disguised as a free calendar template. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.cc/pify?keyword=calendar+2019+free+template
    • http://files.peaceoffaith.net/uploads/1/3/0/8/130813042/pizaw.pdf
    • http://files.mahuadesigns.com/uploads/1/3/1/6/131606733/9926456.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7108/6492/files/tepubewumizorujepokix.pdf
    • https://cdn.shopify.com/s/files/1/0437/5805/9671/files/8971744287.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/75742188177.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9164/files/71839546698.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/69665253344.pdf
    • https://cdn.shopify.com/s/files/1/0440/1093/0341/files/numerical_methods_to_solve_partial_differential_equations.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/sqlite_db_browser_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/navedulexafino.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/history_of_islamic_empire_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/early_transcendentals_8th_edition_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/sotusigogovabolipasip.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_off00009970.bin
dcff38c7fbb480b74e639ecc08c41257b8e74a386bf7bfec06e1eed04cbb131f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9970 5396 bytes
font_01_sfnt_off0000abb8.bin
5269cc71bcbb4113bd669753da2406804fc461f6944f364fe9dcd056b1e0690e
pdf-font-stream PDF embedded font (sfnt) at offset 0xABB8 10536 bytes