Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6313702d5e1aed…

MALICIOUS

PDF

36.5 KB Created: 2020-10-10 16:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3e40f1c7f97f4ebbcee30d6e6b8936ba SHA-1: 2cf4ba7311bd6973f726c1cc21040e995cec75c8 SHA-256: 4c6313702d5e1aed36ec6cc4434e4f6f34bdddcb66b0cc755e519e2ea7fdc1c3
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/strik?keyword=mmd+model+download In PDF document text
    • http://dedez.forestecotherapy.com/uploads/1/3/0/8/130874175/polezoboviv_denosawiguv_zuzanunoxideniw_viregubiv.pdfIn PDF document text
    • http://tagabixas.helpbuildit.net/uploads/1/3/1/6/131637409/9057903.pdfIn PDF document text
    • http://files.nolimitsforfashion.com/uploads/1/3/1/4/131438044/46736.pdfIn PDF document text
    • https://site-1039948.mozfiles.com/files/1039948/6628927309.pdfIn PDF document text
    • https://site-1040785.mozfiles.com/files/1040785/bujikodapof.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/ba2eaaa6-6ae6-4d69-8457-51fb5bb67ed3/zazijaselokemuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c66424-6570-4484-89c6-59d2361a3376/8235104411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8470a6-3f6c-4390-bd96-8c940c43206a/75308848157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0572351c-0231-411c-8ad3-39ee5f0d3a22/mazinefobipavolozapowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bc3430-e7e2-4dad-bf3a-0b8f4d313bf8/porojaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e04057b-5e01-4c9b-a71b-5b0c75b2cd3c/vexax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca7d7a3-203f-4468-a521-7248874b7568/vidubogikuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94493bd-916f-42f4-8a51-9925647ba71f/labemebibivepejerize.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_off000045ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45AE 4452 bytes
SHA-256: bca0135e15912714262ea6b0d936f08704c5509211e202e0943a0fbecb1e175c
font_01_sfnt_off000054c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54C1 10128 bytes
SHA-256: 75f6ab8bdfe16b4cd0799e6efdae14ea430144d8396bda5790b7bd3fcf562051
font_02_sfnt_off0000777a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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