Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfae65464c1720b8…

MALICIOUS

PDF

54.3 KB Created: 2020-08-22 16:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c05c2ea6b6e100c664b4d9a6220961d4 SHA-1: 0063fe3d4db5b237f0e5106bd382c08e135ee486 SHA-256: cfae65464c1720b8748c76a7c356a39773a4070c51ee52df2b0380d5eb30e81a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'evaluation report format'. The heuristic firings strongly indicate malicious redirector and link farm activity, suggesting the primary goal is to drive users to malicious infrastructure.

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=evaluation+report+format In PDF document text
    • http://files.upstairsartgallery.net/uploads/1/3/1/6/131606429/lugosofonovijig.pdfIn PDF document text
    • http://files.asaphteachingministry.com/uploads/1/3/1/6/131606003/4167bb9c1af96.pdfIn PDF document text
    • http://begadup.laingsburgbands.com/uploads/1/3/0/8/130814178/4554546.pdfIn PDF document text
    • http://files.finneranmuzzey.com/uploads/1/3/0/7/130740017/59425.pdfIn PDF document text
    • http://lawaj.kapanshipman.com/uploads/1/3/1/0/131070447/2800077.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/1/0437/1133/2507/files/kopebavowabupodugurinop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1121/1417/files/bronconeumonia_en_nios_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6561/4234/files/72803553064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/guwadunajefepoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/77142221797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/98311777302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/70107107366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/45877982254.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_off00009998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9998 4884 bytes
SHA-256: 707ab939dc7bf6ed51d1c95fbaebc1a4c53ad053987d242b12c169bdd4e20d4d
font_01_sfnt_off0000aa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA27 9976 bytes
SHA-256: 7880ee45b24ada11b04eaf7d07fc6cdbd9bedbb87e27b1b244fbba91298b40be

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