Malicious PDF — malware analysis report

Static analysis result for SHA-256 496d275eba775198…

MALICIOUS

PDF

41.3 KB Created: 2020-08-11 15:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ae94c59e03aa4844bf384859285f9cc9 SHA-1: b8b4e3e36fe499609200d2329eb0fae0daf53cf1 SHA-256: 496d275eba7751986a68652dbddb12bd2fdb20c26310dee18c1bac3936c818e1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate traffic. One of these links, https://ttraff.com/pify?keyword=diagnostico+auriculoterapia+pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, suggesting an attempt to direct users to external, potentially harmful, content.

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 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.
  • 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/pify?keyword=diagnostico+auriculoterapia+pdf In PDF document text
    • http://nonesapom.hannahrasch.com/uploads/1/3/2/8/132816202/dexenidet_vubixinar.pdfIn PDF document text
    • http://files.cjsteele.com/uploads/1/3/1/0/131070561/2563515.pdfIn PDF document text
    • http://files.naazneendiwan.com/uploads/1/3/1/3/131379680/6614760.pdfIn PDF document text
    • http://wekibugir.amyspeechlanguagetherapy.com/uploads/1/3/0/9/130969465/9501935.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/1/0436/3649/0398/files/acute_pulmonary_edema_nejm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2058/3065/files/27243398613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/26198462085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/wofafexusuvuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/shirley_phelps-_roper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/news_report_writing_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/jaxewosageregusunogidun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/bozowelepodijorudusat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/daisy_powerline_880_repair.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_off00006469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6469 5320 bytes
SHA-256: 7c2b398aa688145fa2b5fcfcd68a5633440cb457d8824d241bd0421c4e530af2
font_01_sfnt_off00007691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7691 9800 bytes
SHA-256: 289d62b3024a2d7ce47626535843838bed39673a81450b339a1ead93ff78a770

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