Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ce400b29afe993…

MALICIOUS

PDF

43.1 KB Created: 2020-10-27 06:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9ddf8897147a9729051211eb2c22856f SHA-1: 3a799fbe9e3f9e132f72a4a9fc758063b636a4d8 SHA-256: a8ce400b29afe9933cf5827e3e5bb4c919431798bbc302b0d0c6b7776b7818fa
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for brand-impersonation credential phishing, specifically impersonating Walmart. It also contains a critical heuristic for a malicious redirector link, pointing to `https://gettraff.ru/strik?keyword=walmart+punching+bag+set`. The document body, though heavily obfuscated, contains references to Walmart and the redirector URL, further supporting the phishing lure. The presence of numerous external PDF links suggests a link farm for SEO poisoning or to distribute further 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/tujakigufemufivo.pdf.
  • 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://gettraff.ru/strik?keyword=walmart+punching+bag+set In PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/tujakigufemufivo.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/vobusuvuzupabu_telobe_xivonamubaj.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/3946499.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/dubugilebizar.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/7554287.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/fokajifidupamu.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/2968844.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/6d23bce78.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/fuvirawiwazisa_savegezakogome_vusados.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_5f9735a1ad004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f8bb1cc4555d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8ca5d99f61f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f9675e413b6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/commands_in_unix_operating_system.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/94311952695.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/minokinegesusuperenarogeb.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/edexcel_ial_chemistry_data_booklet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e6b2a0-1338-499a-a966-3934066d7771/vajaxenoxepulubimosez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92136697-e601-43bb-a465-073cc01c35ad/wafupijagafazamowosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf807f9d-d54e-4102-93bb-16a7d0b4112d/15520034212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b94374-836f-4149-9e57-91a63e0a1187/davy_jones_plays_his_organ_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daf6795-f8b2-4b36-ad53-f7d14cf772d1/pleasure_gardens_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/tiluk.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/47273768974.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/analog_clock_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/79298065225.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_off0000673b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 5500 bytes
SHA-256: e13fd03a6cf7a7f2790f13288813d3b154354e9e699737cdf5a7ce1365e3b68a
font_01_sfnt_off000079c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C0 10800 bytes
SHA-256: cdcb3d7eceb54703c66836458cb1b0b4dd2532da933e45d9f1d0b34d997f62c1

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