Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bdeacf19ff8f91…

MALICIOUS

PDF

49.3 KB Created: 2020-10-29 14:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1bc19541d8e3ca84a54634cdc633c9f SHA-1: 1cb62388e8ca392084d92add189a30a0a73521d0 SHA-256: 95bdeacf19ff8f9177995605e4874b2d09282d80f5c774cf503b7c58b14fed90
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL related to pellet stove error codes. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or scam attempt.

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.cc/123?keyword=englander+pellet+stove+error+code+5d In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f89d58d70e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f8c40d384501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f951601ed384.pdfIn PDF document text
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/tapipogixoxisumep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f962a5eaf97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f8d89dd778c2.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/9338156.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/81ddcfd5-ba2f-4425-a6ee-7d17e5508ecf/bokavaralujosulodamited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f84f66-bee4-4318-b769-37d57d418bc3/wuxosifexezulit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5cbeef-f666-48e4-98e8-d1fe00ada11e/77589461514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e917bf8-47df-4b1b-b80d-8f54e8531445/sewirezokimonipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a82f58-e92b-4ca7-8849-c4c09c54599a/28909103147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cb4c08-660c-4bc3-817b-7daf9d39e01f/yamaha_ybr_125_manual_download_free.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_off00006be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 5384 bytes
SHA-256: f23ae71a96809793bda6d64542dbd4817c89a7472da7597e64610bca5ea354c1
font_01_sfnt_off00007e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E54 10544 bytes
SHA-256: 02d765d33ce684f92056b8719e63e88de576ba94edba8dad953130355f5a6e1b
font_02_sfnt_off0000a26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA26F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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