Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ca42ff30fba137…

MALICIOUS

PDF

48.9 KB Created: 2020-10-25 07:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 389305bbdd0b65dc8caffcbe26db2d11 SHA-1: 3794c4f16437433831418c46f0a88795bb6a3eed SHA-256: b7ca42ff30fba137ba45f08f99d9e3a4255b9c44516d073c4f6e81c60d37d273
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify and Amazon S3, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/123?keyword=android+10+versus+9'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded links suggest an attempt to direct users to malicious content or infrastructure.

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://ttraff.ru/123?keyword=android+10+versus+9 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f90a744ef899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f89afeace8b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f91fc301adf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5f9426eb62516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871c3d99f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5f92765ba278c.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/1/0500/9919/2003/files/64071812451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/viaje_al_centro_de_la_tierra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3485/2514/files/377_watch_battery_target.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2384/3996/files/36126910980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8fd44f-65c1-44c8-b174-10c2adc5eb33/likedapoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b35d23f-92ac-4109-92fd-396ae56dd50c/saga_age_of_magic_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/pukufusisuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/wagono.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/kewata.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/siziximorisiforudobisiw.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/analytical_method_development_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9017/4886/files/donjoy_iceman_clear_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0509/5331/files/cbspd_management_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7049/5138/files/teaching_profession_subject.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9129/8978/files/further_maths_edexcel_textbook.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_off0000826a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826A 4976 bytes
SHA-256: 55235d2b4bdfe451fb549a47b8c4d71b6340f1ed8f0b145bab7ac57de7b37fc1
font_01_sfnt_off0000936d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x936D 10340 bytes
SHA-256: c7bf804f165ad89db566c45ec91a167036244323724d7831a19187c0b587aa86

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