Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe48b587e0f129f6…

MALICIOUS

PDF

44.7 KB Created: 2020-10-16 12:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 78863a8a0c1faf589b751205065813b9 SHA-1: 9555754fb1cd8548f42494e10b015dcc4ebb6f2b SHA-256: fe48b587e0f129f6ed9bd077dfcd963533320db24642136336137758a6e45618
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to artificially inflate search engine rankings. One of the primary URLs, 'https://gettraff.ru/123?keyword=mental+subtraction+strategies+worksheets', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to drive traffic to malicious 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://gettraff.ru/123?keyword=mental+subtraction+strategies+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f88bc05b5e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f870e0fc3390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87cb9b33748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f8915ed75601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f873539b6eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f890fed93740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f87655deea1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f884b66e2e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f891ecae7393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f88da479fc20.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/1127a31.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/ginepoloduxeronew.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/1657575.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/f5df2391.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/309e125d-a7d4-48b6-9496-493a64d3d439/poxetamasiwomirisevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1eb823-05b1-41c5-adee-46a172986050/38069399303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a54bad3-562f-43e0-986f-5ffff112a192/jujemokalamitovul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3db70b-7356-4c78-92c4-6c80591dbd41/merefus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bcc1f3-171e-465c-84df-21d6eedcd057/gutozutodakodusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c2d521-49ae-4a7f-bc4d-ad1c9b943b4c/xanepugepowupujesot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e95563b-b021-4fcc-a4cf-7139a5ea0980/77867121396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b4082b-d1c8-4c74-84f5-9f8d5d05c560/tipavidabiba.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_off00007159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7159 5364 bytes
SHA-256: cf9686073cf828f17f244b1dba81db1b732cf6d74ac344435b34db5f06705367
font_01_sfnt_off000083a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A1 9780 bytes
SHA-256: d1966292c02845fcb658511fd5f3544736354e7e91c0ba684e39ed5fa820978e

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