Malicious PDF — malware analysis report

Static analysis result for SHA-256 c931d6605bc959b1…

MALICIOUS

PDF

42.4 KB Created: 2020-10-16 06:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9fc1b7732aa0febfbc33a56d18ed8192 SHA-1: 7292a2131384ca60a926d1c0d42ff27db65d779e SHA-256: c931d6605bc959b16705b5c002491093fe66f38bef9da581844173fa2b0b5522
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to harmful content or phishing sites. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/pify?keyword=diagnostico+ambiental+del+peru+pdf In PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/133b33cff0.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/1385426.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/9275d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f88fbf92f3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f890b9da9167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f88170d4221e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875bc2b0933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8755ed87444.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/97358ab1b459a3.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/wotigi.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/pegefidokoxim_wobofebiwepulaw.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/risite.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/laderote.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lonevu.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/wibenarabixoderi.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/1/0483/4115/5993/files/paradise_bay_download_ios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9392/7081/files/lifetime_fitness_rockville_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2242/4480/files/is_the_term_founding_fathers_capitalized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba55b8d-39a7-4097-a54d-cfceafd6c1ca/48189615069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bec100-1036-4745-bffb-60c8e80b5bd6/14540359364.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_off00006583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6583 5612 bytes
SHA-256: be15d20921e8e3e350bea6eab20a51e6355e8fd521dfe33d75fa65d96e7353b0
font_01_sfnt_off0000787d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787D 10576 bytes
SHA-256: d74de8cfa74449337a402f914ed605745dd481d17042220b5ffe6cf8c2c5cb5d

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