Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a88347a6bec27e…

MALICIOUS

PDF

47.3 KB Created: 2020-10-30 11:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 59f9e3616effce8ec66029ff17bed538 SHA-1: 356cc5c2d87cd71ea15835474fe1403c9118294d SHA-256: 33a88347a6bec27ead53b3ba12a31f9c51cc763db41206ceee2e0d03399c4139
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to other PDFs, which is indicative of SEO poisoning or a link farm. One of the primary links, 'https://cctraff.ru/strik?keyword=return+to+zero+anime', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://cctraff.ru/strik?keyword=return+to+zero+anime In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_5f8ba13d6bdb8.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/d63b4.pdfIn PDF document text
    • https://jagamasukibo.weebly.com/uploads/1/3/4/4/134493784/xusipofigiz.pdfIn PDF document text
    • https://nigokozop.weebly.com/uploads/1/3/4/4/134436215/dexonuxuzixano.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/gigejazodik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f8a043d7ff43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f907e12975e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f8eb35b5a924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resixexi/rex_84_king_alfred_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd837e49-7259-447b-9119-664f99a072db/bitejekelisenazavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab71203-2310-4313-b88c-c722c91d817c/pelenegureporedeterudum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df21b8e-5a1a-4761-bfe8-2f03af304c41/96154925728.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/chemical_formula_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/learn_swedish_language.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_off0000777a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777A 4680 bytes
SHA-256: 5894405e5050fc9e3afbf71f2dc74801a5e9e0a8aa4c57aea8a74b12ced2889b
font_01_sfnt_off00008754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8754 12148 bytes
SHA-256: 382fbd2da51185a67ce4d872bbd49bc513d1138960a7d7827844bb69c2a53e45

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