Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd94f044e68643c…

MALICIOUS

PDF

44.0 KB Created: 2020-11-05 11:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e6a31d8260866b3833b11a00640ee92 SHA-1: 990dbc4f096c71ae267bf04e0f7bd58dd1db6f24 SHA-256: fdd94f044e68643c0ce90620a453ca3e8ee3c1c8367fbbdb70dcc29a2c504ebd
204 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one pointing to a known malicious redirector. The document also functions as a link farm, directing users to various PDFs hosted on disposable domains, indicative of SEO poisoning or malicious redirection campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?keyword=husky+utility+knife+blade+change In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fa258be8680d.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/venewatalagiguk.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f95eded629ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8d251b7dae9.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/tejuwekugotibazuboka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f8b602724bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f870213132bd.pdfIn PDF document text
    • https://kedupopadas.weebly.com/uploads/1/3/4/5/134588367/dukiwevo-xorivizel-voxale-wolatatom.pdfIn PDF document text
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/kololunaxiv-wexugidaji-dijisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5f8e7e4d07261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f8f87c4eaba2.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/813cf1644869f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/184fb9e3-9099-4a69-9e88-bdd2943a33eb/ejercicios_resueltos_nominas_incapac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6e62b1-8f05-49e0-983a-a42218fe2e1f/89637894949.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_off00006d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5A 5452 bytes
SHA-256: 55bbcd751419ee36d175f7b72ae0dbbeaccb5103fac4ec3c338784933eaeeb67
font_01_sfnt_off00007ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 10264 bytes
SHA-256: fe471e1df9341a3fa26d69b644e593ebd4c42cb128a8ec95a45ed755a582b5bd

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