Malicious PDF — malware analysis report

Static analysis result for SHA-256 539dd2ed238a436c…

MALICIOUS

PDF

50.4 KB Created: 2020-09-21 08:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d6a89096c2bb149a70e0f6f2480cec28 SHA-1: 2d3a412aafb9100305177b086bd3092d8a8292f0 SHA-256: 539dd2ed238a436ce5c0c8963862fcb1641b70f258fa31e305898b3248510d57
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a malicious redirector and link farm, indicating it's designed to lead users to malicious content. The presence of numerous embedded URLs, including one pointing to a known malicious redirector, supports this assessment. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.link/wix?keyword=dragon+quest+builders+2+prima+guide In PDF document text
    • http://xodazuzew.alabamamidwivesalliance.org/uploads/1/3/1/4/131453013/dadinijon.pdfIn PDF document text
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdfIn PDF document text
    • http://tupeb.indiajoneseatery.com/uploads/1/3/2/8/132814930/miribonomugimi.pdfIn PDF document text
    • http://files.honeybeehillart.com/uploads/1/3/1/6/131606434/piware-levejugi-nafaxu-kawubarixebepop.pdfIn PDF document text
    • http://sefis.cheytalks.com/uploads/1/3/0/7/130738667/3cc7fa92712.pdfIn PDF document text
    • http://files.lesanelesesneunited.com/uploads/1/3/1/4/131437987/672def63947a.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://6fd7ab55-7521-43bf-b6b3-38adfcb422f6.filesusr.com/ugd/704566_b16969858fc145f7b5f0dfb04137c154.pdf?index=trueIn PDF document text
    • https://dfdd955c-a239-4e23-81b9-11407e5c3675.filesusr.com/ugd/594ae5_de32fa281bf448b786a6e6813640015d.pdf?index=trueIn PDF document text
    • https://31e175e7-37d8-4380-be76-af275095f923.filesusr.com/ugd/cbdbb6_fca7f249e75947d7857a205d1e18eb55.pdf?index=trueIn PDF document text
    • https://76161fb8-02b5-494f-901f-40786805b386.filesusr.com/ugd/3283b0_4dea5fab7d0d4892aed3fcb36818d053.pdf?index=trueIn PDF document text
    • https://688c7f1e-42d6-4210-8ac8-0dd2c0eddb23.filesusr.com/ugd/d6b5da_d7537fb648b54345a04727696aa304fd.pdf?index=trueIn PDF document text
    • https://a6952d74-7144-4ad1-83dd-8f1b42f5fa6f.filesusr.com/ugd/bba345_b424da1d966d4dbb9880f0cde4662a72.pdf?index=trueIn PDF document text
    • https://553ba562-afb6-4c1b-a016-87d2175cfdbb.filesusr.com/ugd/941881_2aa86a34cf594da287d901c05342e017.pdf?index=trueIn PDF document text
    • https://b2d6a947-a2b7-4c59-9e3e-deaebd901150.filesusr.com/ugd/0adedf_3da1dd2caaf647f887f4b4534fbf68d4.pdf?index=trueIn PDF document text
    • https://811a744d-bccf-476d-9bcd-68f050269b5a.filesusr.com/ugd/668a47_c0efd5db7f6342cfab4c83c36f4a7390.pdf?index=trueIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDB 3908 bytes
SHA-256: efbb1f53c908202fa5238c0fecca65ba3d950450d490e1396d149934786eb9b8
font_01_sfnt_off00006cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB7 1556 bytes
SHA-256: c112c5de11af5fc223dd35717672de6ae11cada894c75d60d4fb04cd8309fd47
font_02_sfnt_off0000749f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749F 5560 bytes
SHA-256: a46dc1a7a920a4569cdd38abcede51f44a5cd9dc629f49df55ef9c3841b873bc
font_03_sfnt_off0000875a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875A 10560 bytes
SHA-256: 524043c1aaff0a10fbd22999dc8d5ccf7e9073a4e37099020c957626d8fcfa81
font_04_sfnt_off0000ab68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB68 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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