Malicious PDF — malware analysis report

Static analysis result for SHA-256 71760cf970b81bf5…

MALICIOUS

PDF

49.1 KB Created: 2020-10-19 17:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 1c8bab9726b30acacd7959f95e2f8232 SHA-1: 2433415d79e50037a533601af4f2eaf48ee70647 SHA-256: 71760cf970b81bf57b926dcade3cf526e2809f8c1080570d356974e93c92b190
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content.

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.me/123?keyword=comptine+d%2527un+autre+%25C3%25A9t%25C3%25A9+music+sheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f86f85ea35d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f8b759611f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8a7598052ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f87c90fa38fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f879e29abc66.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/mifavolijag_vexelum_biriki_wotawope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f873d406a2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f8b1f076f255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f8d2e104f5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8c3c9aa471b.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/6680540.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/5061767.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/pabegolasati.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/wowabaxisefidet-nikuvajekibesim-napoxalapa.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/1/0497/5368/6180/files/plant_cell_image.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3495/8753/files/gcu_map_of_campus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5198/2233/files/kunozexoxudufipiwezifazid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2138/1015/files/fafukizenegag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2957/3031/files/22201505764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb75edb-6db9-4744-9e8b-e328b81fe90a/niwawor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00940758-40c1-4810-95b5-f0830a2625a0/mupanosetomagofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a297c88-bc9e-472c-9681-1560faee965b/59345508740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d43864-1783-4193-ab60-cd34120b759a/96114274593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ee7f7e-d051-4557-bf9e-ab7bec3ca481/nufuxanavi.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_off00006fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB3 5444 bytes
SHA-256: c49fa082fb63600a6c98a9f4fabcb9ace8d2dfafa1aae6723642a0b551b0239d
font_01_sfnt_off000081c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 16836 bytes
SHA-256: e0e172d853b19893e668778ed43b5edc19b79078a79e9541dd634ea39cae97d0

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