Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dd566b7de17431…

MALICIOUS

PDF

56.6 KB Created: 2020-07-08 20:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 9f317ddb2bdcdc1ef63558a8399eec6d SHA-1: f0ffc716d0b2fead97ed1be912ee89ab3e07cf86 SHA-256: 92dd566b7de1743157b396d5703f7f1cf14515ad5dc84625863c2c455a6ecb30
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links designed to mimic search engine results, specifically for a 'fluke 117 multimeter manual pdf'. One of the primary links redirects to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains references to these links and the wkhtmltopdf authoring application, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.com/wb?keyword=fluke%20117%20multimeter%20manual%20pdf In PDF document text
    • http://files.blissbeautytruro.co.uk/uploads/1/3/0/8/130874095/59bc104123c3ea.pdfIn PDF document text
    • http://files.iscad.co.uk/uploads/1/3/0/7/130740433/zegupabuwifos.pdfIn PDF document text
    • http://files.wormfoodforthough.net/uploads/1/3/0/9/130969243/e9c22e71c4f8.pdfIn PDF document text
    • http://files.savagepointbedbreakfast.com/uploads/1/3/1/8/131871677/0d7e37f874.pdfIn PDF document text
    • http://files.yesternoir.org/uploads/1/3/1/3/131384249/tamezabunozape.pdfIn PDF document text
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdfIn PDF document text
    • http://files.haddac.co.nz/uploads/1/3/1/8/131872178/xazinu.pdfIn PDF document text
    • http://files.smrtartdepartment.org/uploads/1/3/1/3/131379320/835922.pdfIn PDF document text
    • http://files.limassolsportsmassage.com/uploads/1/3/0/8/130874129/laxuvovobopekidom.pdfIn PDF document text
    • http://files.oakwoodbaptistmilan.net/uploads/1/3/1/0/131070379/2275896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://figesewo.files.wordpress.com/2020/07/jorufusadidufug.pdfIn PDF document text
    • https://pijovunim390864220.files.wordpress.com/2020/07/xevorokematefapev.pdfIn PDF document text
    • https://ditilepikap.files.wordpress.com/2020/06/52013556600.pdfIn PDF document text
    • https://lijopiwa.files.wordpress.com/2020/06/fuxezatobekefasitik.pdfIn PDF document text
    • https://puxekagoduse.files.wordpress.com/2020/06/22697180402.pdfIn PDF document text
    • https://tezisoka.files.wordpress.com/2020/06/91345723856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.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_off00009540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9540 4932 bytes
SHA-256: 0c6d9691bbdda3fd3d5d805ba5862bfc7d2a0d03aaa00856bb300467b4fc7d8d
font_01_sfnt_off0000a5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F0 15212 bytes
SHA-256: 44e0d7c1da15ae843b27befb4f319b01c4f78fbfb115d07cec5f64780821ec82