Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f1a23e6b6cc411…

MALICIOUS

PDF

37.9 KB Created: 2020-08-22 17:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18473aebc50c1f5357cd3dca2fa5e9ed SHA-1: 3e88c47f876c3406eaf8dd27a34e82a8cc2adf44 SHA-256: 05f1a23e6b6cc41142816cb7b56a1504a093b27b03952997872290f47a9de9cf
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, masquerading as a software download. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple links points towards a watering hole or phishing campaign.

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.ru/pify?keyword=foxit+pdf+reader+for+windows+xp
    • http://files.vsenergy.us/uploads/1/3/1/1/131164250/latikajosev_tovukidobidav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/modelo_pedagogico_tradicional_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/28953537385.pdf
    • https://cdn.shopify.com/s/files/1/0431/7498/5885/files/manorama_year_book_2020_tamil_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/adding_fractions_with_unlike_denominators_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7363/3432/files/nebewemul.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/33945385205.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/8772033183.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/73317460702.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1367/files/carpal_tunnel_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/94925789966.pdf
    • https://cdn.shopify.com/s/files/1/0448/2839/3634/files/fusionner_plusieurs_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/21967174237.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_off00005635.bin
bd2bb3374d345197d99dcef2c2e9b0deb1c1f30462a08a82484adfae2318ecf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5635 5120 bytes
font_01_sfnt_off000067c9.bin
d269372fd3d41cdd7d5f8b658ad0fefb7f11f4ed6e5a7888ba343f705613030d
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C9 10252 bytes