Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c856d68155a94b7…

MALICIOUS

PDF

40.3 KB Created: 2020-11-02 21:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d4f981109d1f06ae2580529699f0b8d8 SHA-1: 4207cd28bbed9297b67ec2872b7387de2896eff5 SHA-256: 9c856d68155a94b73362d120b62183ac61125273a9cd4da2d9866ec94ae9f652
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is https://ttraff.club/123?keyword=whirlpool+quiet+partner+iii+dishwasher+reset, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to external content, likely for phishing or malware delivery. The ML classifier strongly indicates maliciousness.

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://ttraff.club/123?keyword=whirlpool+quiet+partner+iii+dishwasher+reset In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_5f9f4530c9930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f95965da7f5f.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/d7a3b0bacec912b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0147/6758/files/swordigo_guide_corrupted_grove.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/6529397839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644d9104-45eb-4513-be16-ca4bdce228a2/vipobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af713f1-9a8b-41fa-9d3c-adf8c8649d79/82456803997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/asphalt_surface_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d45f73-eb50-4149-b424-ab409f786aae/95800171182.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/87248082108.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2907/6419/files/national_spelling_bee_7th_grade_word_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b7b7ec-7f67-4542-8d00-a50cf663b4e9/43859052963.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_off00005e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E87 5276 bytes
SHA-256: d8e0d0db37d4144520c61c00894d5b424a99331d112b726173fc440e3af9e64d
font_01_sfnt_off00007081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 10580 bytes
SHA-256: 8df074e06f8702b3b95fb3542e54ca911e61e8beb1119e9c51321ad38ba6616c

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