Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c11896f9dbb215…

MALICIOUS

PDF

58.1 KB Created: 2020-10-07 05:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b12765d750c0a7a5c5b35c1452798136 SHA-1: a4eefef238df064ed884f03121f12c8b11296e03 SHA-256: 31c11896f9dbb215b276e58149f2ac1b571bd8d1635f823ad3caaa5afaa70cfa
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://ggtraff.ru/strik?keyword=tashahhud+pdf+bangla In PDF document text
    • http://files.weavercenter.org/uploads/1/3/0/7/130776517/pozobutobalup.pdfIn PDF document text
    • http://zemak.heartnhands.org/uploads/1/3/1/4/131408864/satunobitofekesep.pdfIn PDF document text
    • http://files.fifilashes.com/uploads/1/3/1/6/131636941/1013827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d28dea-8874-4237-b0e8-072462fe3eae/42562865989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b34d405-2235-472a-8eab-c380b1af1f81/23854619718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3b599f-a765-4f56-9ff3-10a2006cb0eb/menagubatuveduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9631993a-80fe-4aa4-b0b3-4a5d5a12ab51/dukixabarofoduwof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee2d087-5c51-4902-aa21-1bc226d6b06f/47095673323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b3064e-7a4c-4147-a458-7d0e77fdbb9e/63710141422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6bcc07-3512-4a36-bb23-2fc66dd57d96/wexefumigalaxijaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8007fe95-5a91-451b-af4b-73f4e2d3b281/22841563630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bd07a3-4ebd-4f5d-ac25-a4edd35438d3/12427502993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4475655b-f8f2-4ba4-80b0-08c97169250c/zufifowevovuf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 5296 bytes
SHA-256: faffd229735b2c7ce9814335d320dd295c986e224be2d1f7ddb1bf8c341abb44
font_01_sfnt_off00008a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A36 10540 bytes
SHA-256: 64d162b738bef98a28ac304170703419211f6bff6fdc9a14498a395d99efef18
font_02_sfnt_off0000adb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB6 24940 bytes
SHA-256: 22f7e5d46161e8e573a123cad49d3be124ea8adcd6d4e8866f2166e399a7d7b3

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