Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ebb3e5e6efd3cc…

MALICIOUS

PDF

46.1 KB Created: 2020-11-04 21:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5bf766c6ab21f206859241a312876862 SHA-1: 454a3af4e6eb9e24e35bb8bf1e7633f0a02c9f3c SHA-256: 81ebb3e5e6efd3ccfbb140b0869648cb36f61fe1eb3a0be1f0bcbad8caed98d3
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for "Rug doctor pro manual pdf". The ML classifier also flagged this PDF with high confidence. The primary IOC is the malicious URL embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.com/123?keyword=rug+doctor+pro+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5f98ef1fb5aeb.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://s3.amazonaws.com/lijulijowivaze/canton_swap_meets_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da69889-14f0-45c7-bb2f-46acb24c8520/20190752203.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/mizugomowukife.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/37115955042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af274705-69d0-44b1-87f1-f5b806be7d9b/movie_theater_in_secaucus_nj_harmon_meadows.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/ccna_security_210-260_dumps.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/82355586355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97235008-2e5d-4334-ba4e-4725c8c1538b/rodupiwedatumonadu.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/31881856838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aac8a87-b112-499f-b126-58e7d3555ec0/what_is_strategy_by_michael_porter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f111fce-c629-4b80-9314-c966db62f5ab/download_mario_kart_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/matokajiwifi.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_off00006b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0D 5020 bytes
SHA-256: 5edebe56b34fd12d017e9a9e5a3bed2d1b225e922e44b010c6536a2304a323e2
font_01_sfnt_off00007c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C05 9900 bytes
SHA-256: 9cadf3f56cf37f946035de2956cb43e3013ef4ae4ed539dc84fd95cf28f3f23e
font_02_sfnt_off00009dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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