Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b13982744af398…

MALICIOUS

PDF

50.9 KB Created: 2020-10-26 19:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 14f90ee24fe2acce1e8f86c43fd3e366 SHA-1: 1639ea19a2a98e03943e42f18ae936d75b910a65 SHA-256: d7b13982744af398de1431b08cc76e25c3aa8a09e007353f5997269de67d4558
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=elements+compounds+and+mixtures+worksheet+grade+7+with+answers In PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/sorelonirijowijejej.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/fawavubu.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/fd28989654d.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/numijoseve_tomilom_lekiwedaz.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/13b897d65df.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/f1a75626ec5047c.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/1809582.pdfIn PDF document text
    • https://gomamatugapisum.weebly.com/uploads/1/3/4/3/134392688/3199863.pdfIn PDF document text
    • https://lukozosa.weebly.com/uploads/1/3/4/4/134485969/6574183.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/65b3c0b9-d526-4f5f-a3b9-770cfd72a699/91628497526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa28407b-89e6-43a2-bc4c-a3a6a998698a/76839943933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a4e11f-794f-4080-b108-e1d287cd9891/a_night_to_remember_by_walter_lord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0070/7488/files/4937611211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/manual_terrestre_de_la_oie_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/72420656061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9175/7737/files/pipojizit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5076/1892/files/28088501244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5249/7576/files/lisujojulasebagaligun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8214/4675/files/91119645200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/parefazubenitusuwul.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/accounting_rules_file.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/temario_auxilio_judicial_adams.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/79989432021.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_off000076c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 5628 bytes
SHA-256: f74e5f42e30c0e76b658c0c1ae656c206b2617f0cf809c0f6b89c26cd825e6fd
font_01_sfnt_off000089d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D4 10928 bytes
SHA-256: b6ec03dbdc234295770c5a7943ee01874b89c896ac326fd5047f0e8f4ff69664
font_02_sfnt_off0000aec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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