Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52ea74f92883523…

MALICIOUS

PDF

48.3 KB Created: 2020-10-29 15:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 17b304419f627017b80626d2839270d5 SHA-1: 2aa9f37c705638a76d8d3526634f16cd88f95d9a SHA-256: d52ea74f92883523e8ae7982f14b370fa6e6c0589a3d440e8c15bb9244954b6b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by heuristics as a redirector for phishing or malware distribution. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=poem+analyzer+tool In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5f9a86b100981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8b6adf903db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8839de4cf05.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://cdn.shopify.com/s/files/1/0502/6398/2233/files/zajenudexikuvesudemowaje.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/nuk_learner_cup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef74fa81-a1c2-44a2-94f0-25b4e176d426/sovulajab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e27f3a0-cc0c-4ce6-bfaf-82201c436eb0/43512350387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23679cce-8f8a-475e-ab55-ced36940301d/1702540056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86da419-4261-436a-aa7a-cde9d169e5d8/54079630048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613950f1-bbfd-49df-a685-c803447187b0/gta_iv_sktrlm_indir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4594/0128/files/kinufajazamibe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 4544 bytes
SHA-256: c33f34b469ed67bf9ebea5eab6bf79c764c946457711c1fd036484081dc84fbc
font_01_sfnt_off00007665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 2680 bytes
SHA-256: f195d2931353bd3f12f848c4c30d076a21cd92b280a0e68aaac25c183e1e7723
font_02_sfnt_off000081bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BD 11032 bytes
SHA-256: 4c9ad20f86488ac46c15eb5d8e27f9d010e68834234fe2d6d549b6cdb47373b3
font_03_sfnt_off0000a681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA681 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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