Malicious PDF — malware analysis report

Static analysis result for SHA-256 809260f911772bf6…

MALICIOUS

PDF

56.8 KB Created: 2020-10-29 02:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fd0ed61b302845d7f3528c52e60863ae SHA-1: bd03ba40033cbc150b3e20be272b91a8be540738 SHA-256: 809260f911772bf64e3a157f5dfb284037b5c7f0ce1ade278cde18acae73a0c0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed for malicious redirection. The document body and heuristics confirm the presence of links related to 'tax refund calculator', suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious.

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://ttraff.link/pify?keyword=2020+tax+refund+calculator+australia In PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/e2f349.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/dinipufo_pomupizutib.pdfIn PDF document text
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/fapupunukojoxem_sixugaponap_mubido_notumigelax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_5f98959fbaba4.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/jaluzaxifubuladawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5f960bcba98bb.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/pazetejafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8db89021f82.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/tufareralew-soxom-fugiravafujipob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5f993e0111850.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/lajesiwijonelex_tigojawax_kisebig.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/6492005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f871ceb8d4ce.pdfIn 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://uploads.strikinglycdn.com/files/b648ef93-1735-4f60-8cb6-6da1f4760fba/39042255178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d131e733-ff0b-4c37-861d-fc381c7f3d6e/momokebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bdc016-7505-40e7-ab9b-8eb85e9587af/77378033913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba8a09a-2109-43f7-be78-db4319a93535/kuwejunovuzisudepakedik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c95878-99f7-4d47-9820-e1a9db93695c/jedogizovirilopofovon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9e4d78-71c4-4e9f-b5b0-370f97e73065/82975934124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa1734a-9bc8-429d-a089-f87caf39dabb/47260084049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c470986-4ce9-4209-b90f-d69f171fb893/85478067975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f39d74-f5e8-4786-a016-32297014c5ea/kuziguxagajebisajug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c5d010-e6f3-400e-b233-c2c7ea56dc2c/5187297918.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC0 5144 bytes
SHA-256: 4329f87087459481ceff5586ce5194da794585ee816da628578754b74cfb1595
font_01_sfnt_off0000a13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA13B 11184 bytes
SHA-256: bc9529910fcceb134bc3a2c47397246e6a2d1fb493599f808a7b90443364c188
font_02_sfnt_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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