Malicious PDF — malware analysis report

Static analysis result for SHA-256 843bfc8915fc0f74…

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 20:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 7df28ce809fa0ce04757fb07ff512a3d SHA-1: 66ac01e2d32040c9deaa1519f52414db56cd319d SHA-256: 843bfc8915fc0f741f5c126814ae189b6ba0c6f800b29d28b772aeb11e99a1a7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various external PDF files hosted on disposable domains, indicating a link farm. One of the primary links, 'https://traffking.ru/aws?keyword=application+of+geometric+sequence', is flagged as a malicious redirector. This suggests the document is designed to drive traffic to malicious infrastructure, potentially for SEO manipulation or to distribute further malware.

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://traffking.ru/aws?keyword=application+of+geometric+sequence In PDF document text
    • https://semefaperovupiw.weebly.com/uploads/1/3/4/5/134507497/nulisotupi.pdfIn PDF document text
    • https://piwuwati.weebly.com/uploads/1/3/4/4/134404243/72401e64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fa515a3a9da6.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/gupaguzo_lapofibitoxi.pdfIn PDF document text
    • https://jaxuwigoba.weebly.com/uploads/1/3/4/2/134266140/4357314.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/zedogesaviw.pdfIn PDF document text
    • https://puduragasesalot.weebly.com/uploads/1/3/4/5/134581755/6488314.pdfIn PDF document text
    • https://xubafema.weebly.com/uploads/1/3/4/4/134447535/sedidotebagur.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/5cefa.pdfIn PDF document text
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/sodidawexese_detiluk_jeseg_ziwataleninig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gosezojez.files.wordpress.com/2020/11/22222672797.pdfIn PDF document text
    • https://towuputuwome.files.wordpress.com/2020/11/robeledabikikulogowiparoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/list_of_queensryche_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/80622753350.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_off00006958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 5452 bytes
SHA-256: fa8bbac56bfc03ce92f09d52fa3aae141ebb5ceba51e62dc26735b9f0f1ab5e6
font_01_sfnt_off00007bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCE 10476 bytes
SHA-256: 1fcc220fb54ffe3f01a5b2a6f12fdfa30092cf01802f640364049274966609bb

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