Malicious PDF — malware analysis report

Static analysis result for SHA-256 a946392c073df53c…

MALICIOUS

PDF

40.1 KB Created: 2020-11-06 11:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 254f63c2b389cdf43789ec540181ea76 SHA-1: ea80cc238ea2e97585864d35b3454c74156396aa SHA-256: a946392c073df53c13f6227e521e643dea73bb13dfe26b0668cf52469131b490
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The primary URL, https://traffset.ru/strik?keyword=calligraphy+definition+china, suggests a potential SEO manipulation or traffic redirection scheme. The presence of numerous links to other PDFs on disposable hosting indicates a coordinated effort to distribute content or potentially malware through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?keyword=calligraphy+definition+china PDF link annotation
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/befude_zobusenil_jasolewaji.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/6163666.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/e569a0a3ce6.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/sowajagilemokaj_sebuzewij_jolepobisi.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/7986930.pdfIn PDF document text
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/verenotovi-pexovi-vomed.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/b076e446-30f7-4b64-8389-d0093808e6db/fallout_3_tweak_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/xaget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05957bd-d144-46c3-872a-7a6e44a509d5/savazowuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ba45bd-3949-40c7-a0bd-d23f79733e8d/47199943249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6776/6453/files/65596102969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5087/5058/files/loxobesobixila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5a576f-2736-4961-97ff-0f4e9e22b81c/fiduwewaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04cca273-4130-4eac-bfbb-b64a41b48b5f/zojederozivusotosudu.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/origami_turkey_hard.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_off0000606f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 5244 bytes
SHA-256: 33b4c972eeea8786751c94cee283a6bba8e0437ea6f8e0b6c6905544b25c6f75
font_01_sfnt_off0000724b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724B 9836 bytes
SHA-256: b6cb68ce46a19d480b93557e110a0f861992452b3511704d1f233db060d8e823

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