Malicious PDF — malware analysis report

Static analysis result for SHA-256 1685975618481c60…

MALICIOUS

PDF

37.1 KB Created: 2020-10-31 21:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5fb93ff9e8d0e06655f6587149c023cd SHA-1: 4bdc518bad02eea6f2a956941bcf6ac5459b913f SHA-256: 1685975618481c604913ff5aeb087a8875376a09411c5fcf11f4de7697949182
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains or potentially malicious redirectors. The primary purpose appears to be to direct users to a network of linked content, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the link farm behavior is a known tactic for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.link/123?keyword=to+kill+a+mockingbird+tkam+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f8f729bdc73f.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/rizoxofe.pdfIn PDF document text
    • https://japewilipo.weebly.com/uploads/1/3/4/4/134471591/zupururotopeso.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/gaxukegudo-jexipageburujof.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/dc897178a829ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5f8d9be49d855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f8c7aef0f4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8ac0c9bc838.pdfIn PDF document text
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/4d93a4.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/8938415.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/a2bf9e7b5b332.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/jamokaroxoj/3117791612.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7114/1575/files/huffer_down_jacket_size_guide.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_off00005300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5300 5504 bytes
SHA-256: 07080b01deaa624c93517edf5357b8273ae003dedf1bf57651a159b6407fe1be
font_01_sfnt_off000065ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AE 9988 bytes
SHA-256: 171f4cad5b111c2987e330c8f38ddaf0a39849e38389fd4741657fecf95db5e6

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