Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c1e18d6bca7266…

MALICIOUS

PDF

62.2 KB Created: 2020-10-26 22:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 587a95c5e31a20c90218955371b3fc13 SHA-1: 38612e226958e95f24a62bee30138b7f6ce1b4e4 SHA-256: e5c1e18d6bca72663a4643fcd4f192940d301cf9170cc49013eb5408973e8cd1
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm designed to obscure the final malicious destination. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector found in the heuristics.

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.me/123?keyword=manitowoc+county+jail+mugshots In PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/tomatedewikuv.pdfIn PDF document text
    • https://derefejoj.weebly.com/uploads/1/3/4/3/134358497/ba6230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/60362503281.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/moral_dilemma_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/exercices_orthographe_cp.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/99527790168.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/96707664156.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/acrobat_editor_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/kexivowavewiwufisanulid.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/40783356094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1713/7051/files/share_android_screen_with_pc_over_internet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7673/9764/files/vepomogoguxevuvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9095/0338/files/mimagozoxawej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/5224/7461/files/engineering_metrology_nptel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/fejawebufobepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3577/0023/files/31144559657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/88060258518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1678/0951/files/handheld_sewing_machine_singer.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/difference_between_binomial_cdf_and.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/detikixexatesuwunogojuvin.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/basic_english_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/12986574299.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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 5392 bytes
SHA-256: 5343eb3e3e7f41df56ab025950650e2f29540cdd8cc0a6d80942e7a5cde152d5
font_01_sfnt_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 11100 bytes
SHA-256: a28b83bf751e7924ceaada8477c90eba722cc2faeebd8ad51f9d2fc3acc37061

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