Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5f3e5aa2f508fb…

MALICIOUS

PDF

45.6 KB Created: 2020-11-04 14:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4948006f430cc1adde6172d0f56beb19 SHA-1: d73a449dcdd69b01472dde42c92d530db463b091 SHA-256: 9a5f3e5aa2f508fbe59af9ab23a6538aee39cb8ae7475473cae32fcfa92d9d2e
214 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a credential phishing campaign, impersonating the brand 'netflix'. It contains a link to a redirector infrastructure, specifically 'https://ttraff.ru/123?keyword=words+that+start+with+buv', which is likely used to obscure the final malicious destination. The document also functions as a link farm, pointing to numerous other PDF files, suggesting a broader campaign. No scripts were extracted, but the presence of malicious links and brand impersonation strongly indicates a phishing attempt.

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://zigeginuserepu.weebly.com/uploads/1/3/4/0/134041232/kopitamanig_sonotekevego_mifeserazota.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://ttraff.ru/123?keyword=words+that+start+with+buv In PDF document text
    • https://zigeginuserepu.weebly.com/uploads/1/3/4/0/134041232/kopitamanig_sonotekevego_mifeserazota.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/xufunow.pdfIn PDF document text
    • https://balijuwil.weebly.com/uploads/1/3/4/4/134403438/8472d.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/1bdd3e05-40c1-4f75-9071-d26083af4bab/mopedenoresidexegigizuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956ec102-773b-4ab8-8795-2d8585d8f9e3/west_warwick_school_department_ri.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/fomekemebivavokaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/tokadijijugegeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41ea7a5-b126-4540-b821-a33ebe9dc47f/free_photo_booth_props_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e364bf-a7f2-4978-8c94-9acfce118595/4146725363.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/93861163549.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/luremapadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa50051f-0d18-4a7d-a0bc-704a3d1d6be6/radunovurodifotuxenosuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ee0e9a-5f95-45b0-bbd2-9bac5ddc24eb/city_of_macclenny_building_department.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_off00006664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6664 4844 bytes
SHA-256: e47795b7a7e84f25f1e403bfe8dfe2c01cfe2475825dc258a27f1ad39bc51bd0
font_01_sfnt_off00007706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7706 10628 bytes
SHA-256: 900cd2e7d2cb10d8926b89d3ae442be58dad06edc7f00cbce2a2b867fcaac5aa
font_02_sfnt_off00009b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B65 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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