Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c73aa81ccbe0ff…

MALICIOUS

PDF

56.2 KB Created: 2020-10-31 06:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5ba321aaf254677cee061323d891a17d SHA-1: c64e7c261b89e06907ef1cd5aed15080a7133cf9 SHA-256: 53c73aa81ccbe0ffa2156c4664dd14e0acbebac6389a8ff6c1b452fca6d6e4b2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://cctraff.ru/123?keyword=6.1+organizing+the+elements+answers', points to known malicious redirector infrastructure. The document appears to be a link farm designed to direct users to various external PDF files, many hosted on disposable domains, likely as part of a SEO poisoning or phishing campaign.

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://cctraff.ru/123?keyword=6.1+organizing+the+elements+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f8e460f588eb.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/6583597.pdfIn PDF document text
    • https://gosedizomomusuw.weebly.com/uploads/1/3/4/3/134313056/9072651.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/490413.pdfIn PDF document text
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/koguzadevexegave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8722689131a.pdfIn PDF document text
    • https://papijavunobo.weebly.com/uploads/1/3/4/4/134476632/mozejatemogokugom.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/dezolarawaz.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://s3.amazonaws.com/wunojipu/earthworm_anatomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2369/4506/files/37946741314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3d110d-47f2-4f9d-990f-0616d3afc82f/fromagerie_des_2_caps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed82709-16c5-43c6-bd35-be89725db737/lisafogazagamuvezarik.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/7664074703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5326/6070/files/92229089823.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A9 2008 bytes
SHA-256: bbdd08fe3e8a245418290e2a955b5db1e1b4af77f95a735e009f353817744ef8
font_01_sfnt_off00008d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D26 5172 bytes
SHA-256: 5e00ddfa08ed8c793ba67626d52c021e3330b6a55ffa7a5a9fd9778b4b872b5d
font_02_sfnt_off00009ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA0 11428 bytes
SHA-256: c875bb8c0d363af2a8cd00636e29b92375ea64eb950f9c26d80e5256da703388
font_03_sfnt_off0000c58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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