Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f5559da9d8aceb…

MALICIOUS

PDF

41.6 KB Created: 2020-11-01 06:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad5df17616248928b62ae031e2065fe9 SHA-1: d8e5e4836b834fec077dc92f047f91cb8a9eb907 SHA-256: 62f5559da9d8aceb42489fec0b9511dd03693358277df21ed362636cedc01f63
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?keyword=scientific+name+for+human'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://s3.amazonaws.com/wopari/difezarozugezavo.pdf'. The ML classifier strongly indicates maliciousness, suggesting the document is designed to lure users to malicious content, likely for phishing or scam purposes.

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://cctraff.ru/aws?keyword=scientific+name+for+human
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f8a9e20dfb93.pdf
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/4506636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wopari/difezarozugezavo.pdf
    • https://uploads.strikinglycdn.com/files/72f8e738-505b-4fe0-a533-11ae200b91b7/new_movies_2018_free_malayalam.pdf
    • https://s3.amazonaws.com/tesodagiwor/mumofuselotirugeduk.pdf
    • https://s3.amazonaws.com/bagisi/64117731477.pdf
    • https://s3.amazonaws.com/vibove/the_periodic_law_puzzle_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/8a5c5ff8-f9ae-4c2b-b75e-b22c7395cba8/ian_malcolm_jurassic_park_figure.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/contemporary_business_report_writing.pdf
    • https://s3.amazonaws.com/wexukufedepim/melocotn_loco_descargar_gratis.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/calculus_early_transcendentals_2nd_edition_jon_rogawski.pdf
    • https://s3.amazonaws.com/leguvefu/fizewipola.pdf
    • https://uploads.strikinglycdn.com/files/94b0068d-48b5-4dd9-93cd-abd714fb873c/59615273034.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_off00006661.bin
08d8b60796108933bdbd0b0d92fbf85254ac55332d43c962f25d7f2ee99c0b56
pdf-font-stream PDF embedded font (sfnt) at offset 0x6661 5016 bytes
font_01_sfnt_off0000774b.bin
4733201d2aab313f3654a0efe1b64379bbf6666ad16d30bb1231708a9b817a48
pdf-font-stream PDF embedded font (sfnt) at offset 0x774B 10252 bytes