Malicious PDF — malware analysis report

Static analysis result for SHA-256 3575b89be21cf00b…

MALICIOUS

PDF

51.5 KB Created: 2020-10-31 04:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: de09eb80817cbe44fda8e63a37c2ba2b SHA-1: 922a8bb5095dca099aceb1d293742e9327868c20 SHA-256: 3575b89be21cf00b214c997eefbe1f1291d8571cb68039b924439c446cf7c824
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains URLs that are part of a link farm. The primary malicious URL identified is https://gettraff.ru/aws?keyword=on+my+behalf+sentence, which is likely used to deliver a secondary payload or phish for credentials.

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 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.
  • 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/aws?keyword=on+my+behalf+sentence In PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/bofepudunaparivum.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/2468413.pdfIn PDF document text
    • https://lasaveba.weebly.com/uploads/1/3/4/4/134488520/3463519.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/borawixis-kegeluruxakij-jabofu.pdfIn PDF document text
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/supazonex.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/zewelupiba_sebokilaf_fugobajegitevi_woxagelunezaf.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/12acedc0-8593-4ea6-956e-944cc7b13466/54760610995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a666dab8-1416-48ff-a535-be24f63f3085/universidad_de_montemorelos_costos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdd3513-26a3-4b45-b654-5a505349a2ac/nafobonewunusodavomutata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429c273c-4f77-4221-98ee-f9d6fd129eac/13635726284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ad6781-a8da-4727-8fd6-12ce2e656eb5/9349983032.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/2244536454.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/soft_skills_courses.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/bevomojowe.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_off000087b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 5292 bytes
SHA-256: 3ad38bf3b11610889aa04af4e16b66e941c9e8f4f5e996cbffa3f078c198387e
font_01_sfnt_off0000999e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x999E 11828 bytes
SHA-256: f97f68ded3c07dbf8f948ae08d002e1a6ff9790b556ad4a49bd85a99c5f69283

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