Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c026a7c86b66be0…

MALICIOUS

PDF

38.3 KB Created: 2020-08-21 04:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1bfb7a8d8e5848681856ed3fbaac7b SHA-1: d340398b3cf4d44dd0dc87138a24f7f65bf7cd6c SHA-256: 5c026a7c86b66be0235ffc6231aba8860efe0628b8d2f485927531ea5c07e5ae
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same redirector URL, suggesting an attempt to lure the user to malicious infrastructure. The presence of many external PDF links further indicates a link farm or SEO abuse tactic, likely to obscure the true malicious destination.

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=fuchsia+platform+heels+for+sale
    • http://files.sttheresefoundation.org/uploads/1/3/1/4/131406736/gowanelogifizot.pdf
    • http://files.emateria.com/uploads/1/3/1/6/131606486/6180696.pdf
    • http://fasimaxog.shireenliane.com/uploads/1/3/1/4/131407535/1646976.pdf
    • http://files.eyer-sherry-promotional-portfolio-2019-2020.com/uploads/1/3/0/8/130814172/jagedim.pdf
    • http://files.ivanazivic.com/uploads/1/3/1/1/131164153/b8847dc8d3321.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/zasukimebisekemivipirovov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/digivajolodozo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4481/3470/files/aaja_ni_aaja_song_djyoungster.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/ielts_reading_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/trigonometry_6th_edition_mckeague.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/biotic_and_abiotic_factors_influencing_insect_life.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9621/files/bukosinepabosavobox.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/77627177447.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/jurubavokugagita.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/madexojemegixunil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/architectural_drafting_and_design_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e2.bin
4a9888727d385c0f83cfc2d6c0fef220d0548b452e03b914a368ccad4518bbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E2 5208 bytes
font_01_sfnt_off00006372.bin
1135d8ec5e6e08df0c952793e1cf2c04444a25c66cc762174d03af54a28f5bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 12352 bytes

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