Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bcf7e0dd7a7948…

MALICIOUS

PDF

62.8 KB Created: 2020-11-03 03:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: aa304cd2fcb117de9ac2dd3740288f1e SHA-1: a6fbe916dfb2394d945a7d0a020272f71036c4c7 SHA-256: b8bcf7e0dd7a794830b2c010ee81f09be1dd0cd7f6440d5c490c7e6ede10b151
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://cctraff.ru/aws?keyword=unblocked+games+downhill+skiing In PDF document text
    • https://bakurisevujukuj.weebly.com/uploads/1/3/4/3/134368754/050df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5f919a512a4b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f92936b8e7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f90acf86e06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f9a4602b279d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f9b24dc95b94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1cbb709-2238-4d07-98dc-43a0335059ca/buddy_holly_true_love_waits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3473/9356/files/94551459849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4578/7074/files/pafevaxuzudebekefirafowod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7772/0469/files/all_yesterdays_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/memirad.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/marazuribefivudap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2951b1-22b3-4eef-b761-3711dae27c02/miwivozediwadobudijiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E4 5252 bytes
SHA-256: e0a972fa9bca85eddc3967fb185496ecb858953223098fafd72a5877b50c4693
font_01_sfnt_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 14192 bytes
SHA-256: 9e9a9794fa31c374e2d55dfd8934d0be30287dcdd8d6b1a0a5ca4b52b22031ef
font_02_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34