Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84545d9558b2d07…

MALICIOUS

PDF

41.1 KB Created: 2020-10-08 13:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ddaaaf2243c247603b5c4867d6ee10bc SHA-1: 77dd4d22b46c1069177742618307f63fa0a705ec SHA-256: b84545d9558b2d07c40cf06d40f9337e9284f87ecd187305e484a7ef029aa379
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, indicating it functions as a link farm. One of the embedded URLs, 'https://ttraff.club/pify?keyword=a+in+spanish+language', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent behind the link farm.

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.club/pify?keyword=a+in+spanish+language In PDF document text
    • http://files.corsonrubber.com/uploads/1/3/1/6/131606094/gararogutunusa.pdfIn PDF document text
    • http://files.lakewashingtonsaddleclub.org/uploads/1/3/1/8/131857916/64e9fa.pdfIn PDF document text
    • http://files.aecdubai.net/uploads/1/3/1/4/131453633/zigidusafuj-genuge-sudoperoj-redoz.pdfIn PDF document text
    • http://files.ponyenzo.com/uploads/1/3/2/7/132741020/e8851493b.pdfIn PDF document text
    • https://site-1039311.mozfiles.com/files/1039311/96059420101.pdfIn PDF document text
    • http://files.everydayarteveryday.com/uploads/1/3/0/8/130813979/guxaxevaduxutediti.pdfIn PDF document text
    • http://fawuv.heritagevalleytreefarm.com/uploads/1/3/2/7/132740218/e2e798765837c1c.pdfIn PDF document text
    • http://files.wcainternationalcaucus.org/uploads/1/3/1/6/131607522/ripawomopuzu.pdfIn PDF document text
    • http://files.balloon-animal-biz.com/uploads/1/3/1/4/131483108/kafosiwasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2577/0914/files/sb_game_killer_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/busoteregejeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0728/2847/files/24149727283.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_off00006193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 4976 bytes
SHA-256: 86f40974f0cd3fdf5edb48fc42a589540ae14685b8768a636a1873942f7b5b38
font_01_sfnt_off00007280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7280 10880 bytes
SHA-256: f30770aaa5d09cb06a8638e501dbd7c5ba9fc0ddd8dbb078bd9a66b2fbc84a07

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