Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b356774249cab56…

MALICIOUS

PDF

42.5 KB Created: 2020-10-29 22:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cce36e44b72e844bdfd1947fbc3d3b48 SHA-1: 27580f3aadfb0320123822458a824d12079fbdce SHA-256: 5b356774249cab568132be57e653cd498b75b0f1cb93d76ccf24329c30a130dc
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that one of the target URLs is associated with malicious activity. The document body, though heavily obfuscated, contains references to academic materials, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links further supports the 'PDF_SEO_LINK_FARM' finding, indicating an attempt to manipulate search engine results or distribute malicious content.

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://ggtraff.ru/aws?keyword=boyce+and+diprima+10th+edition+solutions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f8d34d29ad93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8885a7dbb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f97081704e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f8912b1b67c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f88b07f03720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1989/4425/files/zarevavegoko.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/wudazobewegubajajajero.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/la_caida_de_tenochtitlan_unam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8394/8728/files/order_of_operations_free_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d08917-629c-44f8-8935-33d74d576dc0/biposukesozawivavexo.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/creative_strategy_in_advertising_drewniany.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227c9d53-773d-4c6e-b8a7-f6a07a9ad3b0/zobifanikebafo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5A 5540 bytes
SHA-256: b56ce01816f187e46bc200f45172c290921b35451d28247d165be0fc29d1b63a
font_01_sfnt_off00006dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFD 9660 bytes
SHA-256: 15bd5966877a4416acca023af45928904046ad91bf1f04d417d9d1d29ee9dccd
font_02_sfnt_off00008ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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