Malicious PDF — malware analysis report

Static analysis result for SHA-256 b315743c33c5708d…

MALICIOUS

PDF

37.4 KB Created: 2020-11-01 19:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: adc8525cce4df7b28221c5487237ede9 SHA-1: 384592006eb2e51ef4dd9cf7524210a7c9b53998 SHA-256: b315743c33c5708d825c54d751dc6ccc7b5de9ee766863ec01e67ec9013b47a5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure or other PDFs, indicating a link farm used for SEO poisoning or to distribute malicious content. The primary redirector URL is https://ttraff.link/123?keyword=women+s+conference+invite+letter, which is flagged as malicious. The document's structure and the presence of numerous external links suggest an attempt to lure users to malicious websites, likely for phishing or malware distribution.

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.
  • 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.
  • 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.link/123?keyword=women+s+conference+invite+letter In PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/3b81d9366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8776ba81168.pdfIn PDF document text
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/5890827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8be910af554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f96949c7d1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f9e812408cf9.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/325dcfa7-41c5-47d7-9c91-8f6d33ed376e/dopamefagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4c3b73-6014-403e-8f1e-fc168bbb5e05/83010600154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b595d6a-a2df-4e34-a480-7ff064c18014/pejukowofosijixejozajexof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9575d50-21cb-45b0-b56c-1ac67dc13624/rivazubudasefobemasisik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6344/1077/files/eschyle_les_perses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecc3284-abdf-49be-9f83-0b66649bdb56/5958489294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd05cbf0-1b5c-4be0-9514-9c9205d26904/arsenal_camera_assistant_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0541/0471/files/rapugomumizunuzesatuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1421/5609/files/63537064091.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_off0000535c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535C 4888 bytes
SHA-256: c6c33af69c4807bfc7d64852fa762f432e35bccb44654a69ab3dc2f8f36d5b84
font_01_sfnt_off00006401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 11064 bytes
SHA-256: 84045c35d5d049326a5729d8d74f236401ed67bc9a4b3728cdcca4b7330fb816

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