Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e0b8605275a0c6…

MALICIOUS

PDF

41.9 KB Created: 2020-08-23 00:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3791e5cf7d55d6a830fa8ba1a9792b31 SHA-1: 3fac7825a546889ad1709503c01c09c0dfac3d24 SHA-256: 64e0b8605275a0c6b2345906be197fc17b60f33b03ce237e2c38cf91e71f87ad
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that are part of a link farm, with one critical link identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a manual for a Braun Thermoscan, likely a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/pify?keyword=braun+thermoscan+3+irt3030+manual
    • http://files.sdgphoto.net/uploads/1/3/0/7/130739016/81c7c81.pdf
    • http://files.crochetcuriosities.com/uploads/1/3/0/7/130775837/5020047ebdd1d7.pdf
    • http://mukon.hiscb.org/uploads/1/3/2/6/132682787/5786600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/mathematical_analysis_2_canuto_tabacco.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/jamavalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5506/files/19767600150.pdf
    • https://cdn.shopify.com/s/files/1/0437/2860/1237/files/fokuxonum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/livre_bilingue_arabe_franais.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/warhammer_40k_codex_pdf_space_marines.pdf
    • https://cdn.shopify.com/s/files/1/0435/5876/4696/files/samsung_galaxy_s10_user_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0461/3373/9673/files/bexilosifamebamijilawupob.pdf
    • https://cdn.shopify.com/s/files/1/0438/6593/1936/files/tepupewutiniruragezipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6840/files/28671961429.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/xunenusojabetuwanugov.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_off00006465.bin
ffd7b0e2e104a97b18260bacb67ebd1e31ba0c9b0aa81e0a136790ecd3efba1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6465 5392 bytes
font_01_sfnt_off00007688.bin
b5621d211f91c354f71ff2dcd4c986d98b4d0213362c2d9895b824b73dae46fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 10872 bytes