Malicious PDF — malware analysis report

Static analysis result for SHA-256 3694aef410b2c62f…

MALICIOUS

PDF

34.3 KB Created: 2020-10-29 14:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e62a64c79f9ed542a755375554579db7 SHA-1: 16982015331c0a4d95d68734363b490158166a47 SHA-256: 3694aef410b2c62fcac0ca3aa6c4ccb8091602adafe956126f8a6f3d7cf8a745
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, including a known malicious redirector, suggesting an attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that align with the heuristic findings of a link farm.

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://gettraff.ru/aws?keyword=electricity+vocabulary+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f92df69340e5.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/wukuzep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5f92876626757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8a17444b5b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8b665b177fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8725624b64a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6966/0067/files/poboleluvutuxoverom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/0399/4015/files/20487618140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12e6da1-2620-466f-9da8-9c260644b140/new_years_eve_portland_maine_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0312/4375/files/1494157544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27735c17-d98a-467c-9fd6-093312040565/12442386392.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_off000046b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46B6 5300 bytes
SHA-256: 2ffa43c3d4a44f8ffaa90760f006d101b38974720d76c60156e89d33ebf1b0ec
font_01_sfnt_off000058d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58D8 10736 bytes
SHA-256: 570bbb494eaf56393e5887c64cff26263c5e00d9931fb82d5df27529ee57ea54