Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5f43a6efe7cf80…

MALICIOUS

PDF

41.2 KB Created: 2020-10-28 03:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dd6a9a30adb0a21efbf22a9479cef5d0 SHA-1: 363227c50b8181b5585981593b2a5c570c49e29f SHA-256: bd5f43a6efe7cf802d9308e385887dd1b4bccd2f3872ae11cf3080224a2697ce
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with the primary URL being a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL and other links pointing to disposable hosting, indicating a link farm or SEO spam campaign. 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.com/123?keyword=mindlessness+meaning+in+hindi In PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/feweme.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/1177329d8c6904e.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/e79dace5b1f.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/kapafoku.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/96ca8e.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vudodapazepipux_kijemomebegax_velagokotukif.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/1061597.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/sebupabi-sagixo.pdfIn PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/5195205.pdfIn PDF document text
    • https://xexofomes.weebly.com/uploads/1/3/4/4/134489610/gojasirizutafes-tovanozekibezu-debor-zadoxexeti.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/8d7c014b2e812c3.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/9d5af0e.pdfIn PDF document text
    • https://fobedixosofano.weebly.com/uploads/1/3/4/3/134377241/vodosidiwuvu_gofizoguro.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/1/0437/6035/3429/files/rac_caravan_insurance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/nijobenuvuvelal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1173/4174/files/monopoly_game_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3739dc8a-8cb0-4ca9-aaff-8b17181bce84/60382954074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47ae78b-304d-4bc3-90aa-09eb72e03aa8/57833640809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357c5965-8043-43f1-89f2-76701e104a3e/division_de_fracciones_algebraicas_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aff9376-4319-4060-b6d4-25d7b2977c44/42730258735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fce31e2-6764-406a-b082-8d03f49d8ab7/mack_cali_real_estate_corporation_by.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfbc3bc-3ed2-4991-88df-9f0e8e727ab2/garden_shed_plans_10_x_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bdc78c7-67b9-431f-a47b-783e0ed09ba5/30760510676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3871d44c-6915-4ff7-8c46-51bd5379c6cb/ninorejizazaturidepipaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52089943-5e98-49ba-b8f4-e9350ef381b1/molamovafelizuresegusu.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_off000061c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C1 5148 bytes
SHA-256: dbefa87328a2edf58479c4785c0740e705026c26e1cf0e93b59c267e17df97ed
font_01_sfnt_off0000731b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 10668 bytes
SHA-256: 547cec0e4bd86009e78ef2685365a894e27a13361f5f907d9324ca2af85b1ad1

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