Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ab3b0905adf41b…

MALICIOUS

PDF

32.8 KB Created: 2020-11-06 17:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 631f2f7e20d39394073d44796cb04334 SHA-1: c2a2caa0d5ace051d8ddfd0793570ef333eba349 SHA-256: a4ab3b0905adf41b66169954a40f94027c6f209fb305f6a7871b4e143b9fe65c
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://traffking.ru/123?keyword=no+owner+groups+roblox In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_5fa1802d7e84d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8af8b5e09d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5f97fd072d1e8.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/4b55b5fbe9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5fa0df4a63e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_5f917f42a34ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f9a06b7cc2e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f88f594b7c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5f9a02c48ead7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8afca800304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f88557daf3fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f9b6a33e6535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f9a46c9c9c3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pozaxatugifu.files.wordpress.com/2020/11/52364960397.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/gokonotiwafataxupawejimon.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/xademajifew.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_off00004567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4567 5048 bytes
SHA-256: fb45ace16922a17d9263865a59a622018b15077dc6c06d7507e0b476a982fbbc
font_01_sfnt_off000056c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56C0 9344 bytes
SHA-256: 7c2c4f40257af3261423d6931d7a1aa1e66c3e699eb6fbf197f8190d44aa8cbc