Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52fba87177aec10…

MALICIOUS

PDF

42.7 KB Created: 2020-11-02 23:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: efb8acf99ec55d1e6b6d9f675ed5c4cc SHA-1: 5899cc745d19cd671540ff5aae5726328a1d2181 SHA-256: f52fba87177aec1096c2ec5eb0ace0cdb09842045389c3cb2519e88edfdba6ab
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, many of which point to disposable hosting services and a known malicious redirector. The heuristic firings indicate this is a link farm designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.club/pify?keyword=what+is+an+internal+disaster In PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/16eb3cd9e365.pdfIn PDF document text
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/7e1f293241.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/mejisasemexa_mexidixuxoguri_pomadito.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/xojezexadesabab.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/f06192683974e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/75ccc749.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/3602458.pdfIn PDF document text
    • https://xufitagetibo.weebly.com/uploads/1/3/4/4/134486135/3652462.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/939983.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://s3.amazonaws.com/vezumobigodub/state_bank_of_countryside_payouts.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/archaeology_essentials_3rd_edition_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1214/4283/files/harga_mesin_jahit_singer_manual_terbaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2716/6918/files/rupudojagatitatepow.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_off00005f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F08 4604 bytes
SHA-256: 79c87d783e51f712b89dbde1dab4c9aab8e802c23a05b62c7f4b74bc2531a261
font_01_sfnt_off00006e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 9816 bytes
SHA-256: fa560317b8ab487cbd8c50a8e217c371c7b3ceb91052050076469da92765f8b7
font_02_sfnt_off0000900c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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