Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0dc056ff4a4f54…

MALICIOUS

PDF

39.5 KB Created: 2020-10-29 17:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b8f695fda016e3cd779570c6dab2c4e0 SHA-1: e2ad9a5d71fda66545ad8bbbc1e858fd33aac200 SHA-256: 4b0dc056ff4a4f54355eb3fad87186966b573e0242909ce2b41f40329f20e709
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness, supporting this assessment.

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://ggtraff.ru/strik?keyword=soliloquy+and+monologue In PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/valifadonujexu_dukevuresigozuk_zaporog.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/efd695a6.pdfIn PDF document text
    • https://mulelene.weebly.com/uploads/1/3/4/4/134440938/rowuz.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/gipekinimijidip.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/8431065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/2008/3110/files/selibikofetosil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1530/6915/files/sshdroid_pro_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/canzoniere_scout_con_accordi.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/16338642589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d308b3c6-05be-4015-b2ef-62118cac7b93/76971853498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0041/3346/files/pinak.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_off00005c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C56 5200 bytes
SHA-256: 6dbcba7cca3fabba13c5a42f223a81d17c535730a1e7aa6f6e5078466127856f
font_01_sfnt_off00006df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF6 10432 bytes
SHA-256: 6d92bbf45dc7e24d9d23247b76f996fc4749d1bed0ac26ce1fed6d7f068b630b

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