Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12b8ee42f5afd6e…

MALICIOUS

PDF

49.1 KB Created: 2020-10-15 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 358999ed928a6c0b74a9f585d213f3ee SHA-1: 533f9903cba87c1330653f2d55b09b6486281912 SHA-256: c12b8ee42f5afd6e141355c0acd6bafe2b533ec8f71e268fe944889d63667436
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious due to its function as a link farm. It contains numerous embedded URLs, including a critical redirector link to 'ggtraff.ru', which is known malicious infrastructure. The document's structure and the presence of many links suggest an attempt to lure users to external sites, potentially for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://ggtraff.ru/123?keyword=sqlite+example+in+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f875bc6588ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f870e67b08ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8768d5b9fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f872a8d66184.pdfIn PDF document text
    • https://site-1039642.mozfiles.com/files/1039642/kurejemulilek.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/8855777503.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/venunigimok.pdfIn PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/f65bf.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/da50c7e0ec8f483.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/f7562321-aab2-44ee-a62e-97f25dadd8d1/78980893184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b1cd9d-6f70-455e-9d13-b8fb6cb99882/15575239457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554be3ef-d33f-4f0c-849f-743830497fb6/26719986306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb19cae-1b4f-4ca1-a9d2-88b3f6bda7a1/vobinufiwolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6eeefde-8247-4007-a575-42f9dec7a040/xakixuneferelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5344f61e-b12c-4f00-9596-8f764ff44683/12313318092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c6024b-96da-4daa-90f5-f2b0189d68dc/wukuzanitomaliwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c2eae0-46fa-421d-973c-0cb93e4aa609/37309153833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2196/6744/files/2003_hyundai_elantra_manual_transmission_fluid_capacity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9777/1176/files/ashi_cpr_pro_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/funny_overcoming_obstacles_quotes.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_off000074f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F1 5224 bytes
SHA-256: d4d3b19bda27da51ce8f245ec05e58787e9885eca66273f62352d385e2efd92f
font_01_sfnt_off0000869a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869A 15784 bytes
SHA-256: 66ed8888c31226fa196ab9a47d41e6813d56568b5ca6be575938fdf77895a971