Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19219a229c454f0…

MALICIOUS

PDF

85.7 KB Created: 2021-01-14 15:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 21fbf19978ec92e91830e9db36cd9629 SHA-1: b0da90ed69d6e95aa088a610b5134c8ead5db2af SHA-256: e19219a229c454f09ea7ba0c836dd6d7618f25bfdabed9c6fed5349d2f032940
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links to external PDFs hosted on disposable domains, indicating a link farm or SEO poisoning attempt. One of the embedded URLs, 'https://traffmen.ru/123?utm_term=watch+steven+universe+movie+online+free+reddit', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document's primary purpose appears to be to lure users into clicking these links, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffmen.ru/123?utm_term=watch+steven+universe+movie+online+free+reddit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fe5ed3d25579.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/6300175.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/download_head_ball_2_for_pc.pdfIn PDF document text
    • https://xinogibujijinak.weebly.com/uploads/1/3/4/2/134235465/mebukemas_nipit.pdfIn PDF document text
    • https://xazunavawotop.weebly.com/uploads/1/3/4/7/134724639/b15c24c42.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/ajioyWs/lireloboposi.pdfIn PDF document text
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/38e0e.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/f9ac7b9a986.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/856193.pdfIn PDF document text
    • https://cdn.sqhk.co/xepubijiko/1jghb6n/wekefepudonedemox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5f8b6d141f7fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/chamakam_tamil.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_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 5336 bytes
SHA-256: f72eeec5bef25df00fe24ba057a2a3cc0239f11aba27e68e3e1f0df02e9bc68e
font_01_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 10520 bytes
SHA-256: 1e86f2dcbfd0cac99ca8f5325b7c8a7bc8023bf6f467f76af00ff22215ac3667

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