Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad73b7c60b52bc57…

MALICIOUS

PDF

40.5 KB Created: 2020-10-15 17:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7582c300d32bfdb16461866a7daa27f3 SHA-1: 663bfb581200bb383d0c8d21c2a91af7bb9943a3 SHA-256: ad73b7c60b52bc57ed50ddebb458800053fc46bc8e00498ef46602ab5f706c4e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body and heuristics indicate a link farm strategy, likely intended to lure users to malicious sites for phishing or malware downloads. The ML classifier strongly supports the malicious nature of this PDF.

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://gettraff.ru/pify?keyword=machine+tools+pdf+jntua In PDF document text
    • https://site-1040800.mozfiles.com/files/1040800/87850327272.pdfIn PDF document text
    • https://site-1038694.mozfiles.com/files/1038694/22120747672.pdfIn PDF document text
    • https://site-1043855.mozfiles.com/files/1043855/soundcloud_apk_premium_download.pdfIn PDF document text
    • https://site-1048457.mozfiles.com/files/1048457/26467089162.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/rotizizalipi-xulejowo-wegevok-xutijub.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://site-1040131.mozfiles.com/files/1040131/soreru.pdfIn PDF document text
    • https://site-1038472.mozfiles.com/files/1038472/torevitetosupifajolitupa.pdfIn PDF document text
    • https://site-1041292.mozfiles.com/files/1041292/13296952255.pdfIn PDF document text
    • https://site-1038529.mozfiles.com/files/1038529/ninurarakafifebiwazalewax.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/baroj.pdfIn PDF document text
    • https://site-1048260.mozfiles.com/files/1048260/sesenogufosijaxuxaxiwameg.pdfIn PDF document text
    • https://site-1048528.mozfiles.com/files/1048528/90717237270.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/fiveguxizonedufojevubur.pdfIn PDF document text
    • https://site-1044312.mozfiles.com/files/1044312/ribenikofuvose.pdfIn PDF document text
    • https://site-1037899.mozfiles.com/files/1037899/zuvumovanepab.pdfIn PDF document text
    • https://site-1037882.mozfiles.com/files/1037882/sekagaviwed.pdfIn PDF document text
    • https://site-1041777.mozfiles.com/files/1041777/1561029764.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/d42b3d36-796b-4afa-81ff-d55080f25bfb/17536521920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea6452d-9eb1-48c4-ab30-2ad4d49073ed/70666764370.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_off00006199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 5228 bytes
SHA-256: dc74fc10d8369b31fb61b2701084acbf95eb12b9cd15f76aa892a25c11080029
font_01_sfnt_off00007364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7364 9852 bytes
SHA-256: bb64912089f431869563a0c40d3117a7758027caadb5e4a68cff31c7202a650e

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