Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8853c7670c4b472…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 06:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 5a403a7c313f1fd3b315ad6c14a7e286 SHA-1: e3eee9a35d67f688e3836a824ec390915115bf55 SHA-256: b8853c7670c4b4722f9b3f205577eb9e4b87fbff9cc69f7016b0e37d7f78b636
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/aws?keyword=sbc+manual+transmission In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5f9c5142d561a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f9a7317de24e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f8fb17fe60e0.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/3bc94e8f-7196-4112-a413-bec642776d69/fogifudurikanema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8795/3564/files/renoniminaxivoxajoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2546/2971/files/47276777820.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8315/2542/files/ladagobenuxeluzifumozonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6747/1538/files/butterflies_of_arizona_a_photographic_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07381379-6f97-4fd2-aaf5-5855d37e2a68/simomoletafesasokiboku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fcb3dd-af11-4f5d-a2b5-701e80d205e5/25363334509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996dee41-9635-4bb2-959f-1b182bb11dc6/zitadujudanixosadu.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_off00005fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB7 5188 bytes
SHA-256: 67cadb7cb276d43556e34e1df6fb22a47f21a0afaa70a47b3e56d6b8c1ce9fe8
font_01_sfnt_off0000713e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x713E 10020 bytes
SHA-256: efe0e92246d9665609aa8ea7e4c449486ccb0488dc7470902fed361ebd8950cc