Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f974d3c0e4adfb…

MALICIOUS

PDF

41.7 KB Created: 2020-10-07 12:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 361bbde69681d9fb6c953a442d79fb49 SHA-1: 158419975b7e13ae2e68d38d925c2f4b423f107e SHA-256: 98f974d3c0e4adfb92badf23d7325790545a116d97812ef6524a94a534a42a9d
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, many of which point to disposable hosting and at least one is a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/pify?keyword=bloons+td+6+apk+free+download', suggesting a lure for potentially unwanted software or phishing. The ML classifier and critical heuristics strongly indicate malicious intent.

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://cctraff.ru/pify?keyword=bloons+td+6+apk+free+download In PDF document text
    • https://site-1048453.mozfiles.com/files/1048453/gezolijitekopuwo.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/gujetesuwuwusuraregaz.pdfIn PDF document text
    • https://site-1037889.mozfiles.com/files/1037889/diririkakigunefore.pdfIn PDF document text
    • https://site-1037896.mozfiles.com/files/1037896/simif.pdfIn PDF document text
    • https://site-1040099.mozfiles.com/files/1040099/lajegasegigakarofagadodi.pdfIn PDF document text
    • https://site-1039261.mozfiles.com/files/1039261/bimirikokezimosuge.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/zetejutudubokiz.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/wusefofereriwet.pdfIn PDF document text
    • https://site-1039907.mozfiles.com/files/1039907/sabonexanararowa.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/779952900.pdfIn PDF document text
    • http://nexenibat.firststatebaptist.com/uploads/1/3/1/4/131406710/9011247.pdfIn PDF document text
    • http://files.melodiamusicstudio.com/uploads/1/3/0/8/130813601/wufokefizozizaz_fibetizati_zirexe.pdfIn PDF document text
    • http://mutawi.actorofeurope.net/uploads/1/3/1/4/131454237/jenomipufekugup_sokefumuxu_vupuwu.pdfIn PDF document text
    • http://files.commercial13.com/uploads/1/3/0/7/130739664/9238839.pdfIn PDF document text
    • http://luzewuva.martindamon.com/uploads/1/3/2/8/132815028/1149158.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/1/0440/3852/0997/files/wind_of_change_chords_by_scorpions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2931/8808/files/2012_chevy_impala_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/0588/7900/files/dogolibegezivi.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_off00006222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 5396 bytes
SHA-256: f75d3c1cac5418fb1e3431c7629b705037544a5ad9f20316b9d72a876eee13df
font_01_sfnt_off0000749f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749F 11784 bytes
SHA-256: 6ac62df91e23782e72125e3a515a1153c7456f71d0ebc2eb34b9e5b490a1cf62

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