Malicious PDF — malware analysis report

Static analysis result for SHA-256 161a9d8771b4d1c6…

MALICIOUS

PDF

77.7 KB Created: 2020-12-04 17:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8a6e27e71a45a3d94c274dfda9915cc0 SHA-1: bfe799523c9f151b198e9305b2650c2a0215706b SHA-256: 161a9d8771b4d1c663c2be8e6afc73d06b277ed28c7da6a3be301c67ac39b58f
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a search query related to beat-making apps. This suggests a phishing or scam attempt to direct users to malicious infrastructure. The PDF also hosts a large number of external links, many pointing to other PDFs, indicating a link farm used for SEO manipulation or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/aws?utm_term=best+paid+beat+maker+app+for+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5fa4a85de92f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_5fb82fd273744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f885ccbdbf7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f8703712c3a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5f94d812c3280.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/20c619d79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f881e77c424b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5f9fba3956a75.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/01d1e72b-053c-412b-8559-0e6fdec0ac3f/reanimated_corpse_in_7_days_to_die.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf52a9fa04221c71171f7d/1606374057814/rowudazetiwevitewozuxitu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ae208845d0924808f9a/1606372067880/xelipewefonozifikox.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11355ab79f442f22aa123/t/5fc147014f983757200e9248/1606502147302/21480828858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64026c31-8a4d-4659-ac39-3866ef774dea/4302033259.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_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5196 bytes
SHA-256: ff1b21c45686bdde4a1051df64fce64133c906fafe15019b0c7d00154fb4d8aa
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10896 bytes
SHA-256: 11ca128fe0a55e68df9744e5182c9a9255b18543738bf155c14d1bd1be36233a
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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