Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3d1ec916caa3be…

MALICIOUS

PDF

37.1 KB Created: 2020-08-23 02:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2123a08b2b0d14ed170dedc8fc7b9a6 SHA-1: 2e163a16bc9eb21cca3851a90cc49054244979ae SHA-256: 6f3d1ec916caa3be27d3f51ce7ee97feb2fb1e4104c22fe7bee08df55ff347fb
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The embedded URL and the heuristic firings suggest the document is designed to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting.

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=google+hangout+software+for+pc+free
    • http://sudasewog.ashequilters.org/uploads/1/3/1/8/131856257/ec0d0cd727c562d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/2241/7826/files/62561661956.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/7457779925.pdf
    • https://cdn.shopify.com/s/files/1/0429/5698/0377/files/niwatojulazud.pdf
    • https://cdn.shopify.com/s/files/1/0461/9829/2643/files/takudokanizijidufekezoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/vupefikidafatujif.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/8810080318.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/answering_kassandra_s_questions_ac_odyssey.pdf
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/learners_license_questions_and_answers_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/90544064610.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/classification_of_organisms.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_off0000527d.bin
14ad766c721d9a850c914727706d032af6fe37b5359c26cb4c3a9dd61053b62b
pdf-font-stream PDF embedded font (sfnt) at offset 0x527D 5400 bytes
font_01_sfnt_off000064ed.bin
f6225a700a5ea452e5edfd85e0140be7f61febda225c0aa84730c410f9bdbf72
pdf-font-stream PDF embedded font (sfnt) at offset 0x64ED 10192 bytes