Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa9200734963219…

MALICIOUS

PDF

54.6 KB Created: 2020-10-28 22:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7498c19489f9e8be0fe9224e3e860b8e SHA-1: 8040ebb68544f6e07b4a8c6551b11996859fc48f SHA-256: 4aa9200734963219d56950f4cca506e35ade8582c26f0dcb3ae8581712f62b66
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, contains URLs that are also present in the embedded link farm. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or to download 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://cctraff.ru/123?keyword=oxidation+and+reduction+worksheet+pogil In PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/finonuk-vipulotoj-lenati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f87647d1133e.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/388769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8bcbc43ee63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f8c6847a8608.pdfIn PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/rofewataxovuva-mugejozos.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5518131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f99a68691383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5f9739b6097fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f8744d4245a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f8c10f9f0179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f902f50803bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_5f983a3b40634.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6532/2901/files/wifi_code_hacker_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/82808397302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4782f9a0-513d-43dc-9e2b-96f7275b5400/mixorurevalugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/nibegusokufewulonigubepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748987b5-1c7b-47ab-b742-2ad46c23d8a7/tipos_de_lenguaje_en_un_guion_radiofonico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd806f52-69b7-4391-9cbf-eb692d41963d/38752258954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01b01df-2bad-45c7-b2af-21ae6a081a5c/32597777558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7094ac5a-b80f-47da-a4b0-b8d3e35eb6bd/66631860318.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 5588 bytes
SHA-256: 7c32ce3d2c66fd5255410a99d9cf277672a9402e77f90e724444306759aee6d5
font_01_sfnt_off0000862a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862A 3232 bytes
SHA-256: aa8682b58e400f3e1e08ee49211a4e584c826066b9e1e565d018ceb7be19ad89
font_02_sfnt_off0000933a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933A 10616 bytes
SHA-256: 9a9f75796785bff33f06607195fc2b92ca69fbab31d7822d6440b1456987e618
font_03_sfnt_off0000b743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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