Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a52a3a746d42f2…

MALICIOUS

PDF

48.4 KB Created: 2020-10-17 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 752f19e77af50d86e900d075aee3842b SHA-1: 7e26c146e0763770b2ae1cce9696217e6db8c2a9 SHA-256: 57a52a3a746d42f2f7b88df98ed0761363fd28bb9b72fa6a47c85a60e4d698e5
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on disposable infrastructure. This suggests the PDF is used to drive traffic to potentially malicious sites, possibly for SEO manipulation or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=organising+as+a+function+of+management+pdf In PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/3721d33eed.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/zuvefusu_tewojawowebav.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/689241.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pusapuxasefopujalu.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/9243459.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/9495529.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/toxikujazijagiwe.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/1724297.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/5653998.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/575574.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/2899710.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/6d6409f5-2be7-4c80-a9a9-904899d6094c/76435530895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7b549b-3b72-4b1c-9abb-0f2ee21b26b0/jojosedujejejokekabegepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e919c060-dd73-4394-b455-2d00004b456b/86643860611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b1f4cd-d8eb-4083-bc11-652a79985d38/zuniki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37ff12e-f048-44c7-94c4-3fbc5d7b144f/xadawamilezujelefajozon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8596008-5d6d-43d5-af7b-f18cae95a7b2/vegetopipewekagemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f380a4-e0db-4a76-9d5e-9b6b65e7ee24/norixipipipixazejibov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630feeb7-6d0f-4668-b551-768c31b83dbd/in_loving_memory_of_james_heltibridl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dd3f18-28ec-453e-8295-cd02989b545b/giboritezumerinek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f510652d-60c7-48ce-a89f-54d41a472302/68126727608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09699d17-c52b-4eab-8f92-43b93729e51e/88815490152.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_off00007f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F49 5468 bytes
SHA-256: 16f7e2aaa997583b3a88267e962259d5fdbe68cf8f3162cf3e7699b894c35e21
font_01_sfnt_off000091c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C5 9964 bytes
SHA-256: b6dcc91c59f117bb607da433f15cd1f0437fa92188b858e90719a1c8129db985

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