Malicious PDF — malware analysis report

Static analysis result for SHA-256 9742070aa8d741c2…

MALICIOUS

PDF

46.4 KB Created: 2020-09-13 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f8f3d97dcb5c102752e981f4d5d1de9 SHA-1: 157263409bb1154aa6cdd4f46976a8277840bc38 SHA-256: 9742070aa8d741c28e4d775a4173bc8358e929f4d837c0609c9ac9d7d179fa6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.cc/wix?keyword=ibm+serverguide+9.63 In PDF document text
    • http://wudabebo.tcounseling.com/uploads/1/3/1/4/131406082/wafurudubim.pdfIn PDF document text
    • http://winat.kellysserenityhouseinc.com/uploads/1/3/2/6/132680981/df7829f43.pdfIn PDF document text
    • http://guxaxeb.maestrodonappert.com/uploads/1/3/2/3/132303354/kajakozokezan.pdfIn PDF document text
    • http://fegetapi.kellysurette.com/uploads/1/3/2/6/132683051/e0dbca40.pdfIn PDF document text
    • http://nupagu.reviewgraphs.com/uploads/1/3/1/6/131636825/jizamitolozit.pdfIn PDF document text
    • http://files.congrevelab.org/uploads/1/3/2/6/132681665/2ccf59c82.pdfIn PDF document text
    • http://fomanajaf.coreducate.com/uploads/1/3/1/4/131454526/zadulexim.pdfIn PDF document text
    • http://lozif.shomusbiology.com/uploads/1/3/2/7/132712413/pidetuleso-rafizosusonavuf-sigawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c692caf4a0a64d8ca1ba09c60602eacc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d2759c_4e33ab5c387d4d58922d673b6db78d55.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d7c203_7d988a6a1b1c423c8a29982fd088c9de.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/5822877708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/kudevusazudogowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/42025367471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/vexodadixibiso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/64702259253.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5132 bytes
SHA-256: 4cf172377258055405ee63a37399de9e0e9a008ee9f51266e1386c815ebf8a13
font_01_sfnt_off000070a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A5 13996 bytes
SHA-256: 6943093ba6a471052f46220cde5b99e33befc43ac41076147511166b306c26e1
font_02_sfnt_off00009c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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