Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35159b173318baf…

MALICIOUS

PDF

42.6 KB Created: 2020-10-05 07:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: bca77069172cdf2fdd2179a35b9cdf61 SHA-1: 4176d29093361fa07f9a04e5a57cc414c6036a72 SHA-256: a35159b173318baf679e079b599bd1f005e93794ea0ce43dce64b71deb971dbc
134 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=the+worst+case+scenario+survival+game In PDF document text
    • http://files.soundscapemusic.net/uploads/1/3/1/6/131637498/f0b70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8093d600-0755-4b79-8603-e57cad804b12/90957068834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20076a22-8371-49e3-84dd-98b272e11e9b/62629507334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baafdacf-e31c-4012-9171-f6dfe16d9716/zosedukasisasip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f8031c-b2b1-4049-9a21-aa269ed00686/dinogavotejuvuvaxezifuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5587dce-d5f0-4436-901a-12b4c746ad76/30950599017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4e62df-59af-4aea-a5dd-d80bf0df7813/kodinigawisupome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9478/9275/files/roduwakemafetusu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5223/1587/files/ruins_of_azlant.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 5316 bytes
SHA-256: dea2ef1b7f4502086d32c6a967f0e586e57381503e765b5b374d6df78e8cbad7
font_01_sfnt_off00007a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A33 10520 bytes
SHA-256: 1eed743a06e041c1471520befffb3fb79c2795e2395e307e350eeb7a9fe5527c