Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3898e549e4f88aa…

MALICIOUS

PDF

45.8 KB Created: 2020-10-28 22:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b73dde47028e8555662f6a9365e32bf6 SHA-1: 2bd5fb6151d76f94d417bb1c4dd7a435b5a0f8c7 SHA-256: d3898e549e4f88aa7c3b0a0cc1515ad81a82941b51fc693cc04249a5254d052d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 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 high 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: call-to-action link host does not match the impersonated brand: https://ggtraff.ru/strik?keyword=pirate+kings+cheat+engine.
  • 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://ggtraff.ru/strik?keyword=pirate+kings+cheat+engine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8a9e219e9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f8c108a00567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f872d0fb87db.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/1/0499/8247/2352/files/developing_communication_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/28010085745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffa0530-3127-4294-854f-7e76b639bbf2/double_peace_ahegao.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1711/8111/files/dijetipelowuzul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade1a7e1-d9ca-4163-a6c1-834a8a6dd157/gipifinurixis.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/d_d_5e_sorcerer_spells.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7706e63-52d6-497a-a0d9-8421329f430e/nixekisatabuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1ad393-7156-45dc-a907-e770fa0ecd98/cathy_glass_damaged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5775/3497/files/biochemistry_of_blood_coagulation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4355/2412/files/download_apk_picsay_pro_mod_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb66fc9e-d363-41bb-acf0-14749bb9ce86/49937725387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1611/6126/files/dividing_fractions_unlike_denominators_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1238/0612/files/17067900258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdeaff13-e244-45ff-8454-064ffd032c9f/read_cruel_intentions_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5301b26a-dcb3-4729-bca5-941a73ba9e82/59183658985.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/15236425214.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_off00006f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6E 5092 bytes
SHA-256: 5fa2a0dbc7851fd1ae271d5e1f27e3549c25d962a4329051d5c215c7d0975c77
font_01_sfnt_off000080be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 14168 bytes
SHA-256: 10f8d712335561977478d6975e6c7ddf532390b7f0777839afecc79c48f0208a

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