Malicious PDF — malware analysis report

Static analysis result for SHA-256 781a3f77e3a2004d…

MALICIOUS

PDF

44.2 KB Created: 2020-11-03 21:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cc4182f191c73da259f5a81648d01cc8 SHA-1: 27ccdde488fd0f8695d12f8da5444f8c0a3dea69 SHA-256: 781a3f77e3a2004da4aabe62f2b380aa1512c828cfe3d05f55522c3cdff505f6
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users into clicking it for potentially harmful content.

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://cctraff.ru/aws?keyword=mcgraw-hill+education+chemistry+answers In PDF document text
    • https://manukigobedor.weebly.com/uploads/1/3/4/4/134481395/b9adc3b6c8296b6.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tipot.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/romuxasusejez.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/pesuje.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/kumaxiwe_lijiluxusodeb_pokudomijufum.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/65a2673c-eab5-4fef-8d5d-b829c377e0b5/2685371324.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/the_prosperous_coach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d680cc39-f0b7-4da5-8497-1dee918da844/mowetulowegeresodawamoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/free_live_streaming_of_pacquiao_fight.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/lufota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cea6df-967c-4ae1-b2b9-ca09b790cd86/24234454106.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/36183163744.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/bangla_quran_meaning.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_off0000513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513F 6540 bytes
SHA-256: cfd525a0ae09d8b7a2c8a932d1cb341dc7344d6f91cb54f3a6ea48e8a741009e
font_01_sfnt_off000067e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E1 5584 bytes
SHA-256: 677dd60f550f6cff27c48e118d3af0fc177376f797b84fba84ceb15ec2a2aeea
font_02_sfnt_off00007ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD9 12104 bytes
SHA-256: afa4fbe6bce6f32425f3a0377271e21dc74f658b8e5912058184611ab61cf7c8

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