Malicious PDF — malware analysis report

Static analysis result for SHA-256 003d3821e67e9e57…

MALICIOUS

PDF

46.2 KB Created: 2020-08-31 09:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eb6c57d8b4ba5391526cac3f09118bb SHA-1: 5f34df98f78e4b885ac46d04074f951d3ee410fb SHA-256: 003d3821e67e9e57dd296c812ee5db4918839ba8e533cfffc088b2acf0bc4e05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, with one specific URL identified as a malicious redirector. The presence of numerous embedded links suggests an attempt to lure users to malicious sites.

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.ru/wix?keyword=analisis+incremental+ingenieria+econ
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c25b15601d124abfb2b9eb54f6c69edb.pdf
    • https://static.usrfiles.com/ugd/5926b4_e9911f1eb6e34bc7a072970189430426.pdf
    • https://static.usrfiles.com/ugd/b8c837_212b67f6c3c443baa6f3cc1608c4a70e.pdf
    • https://static.usrfiles.com/ugd/f65175_e1dcf83a3e0d4a228c8cab5192f5ab59.pdf
    • https://static.usrfiles.com/ugd/21e6f2_a7b58530f6d54be991527d81ae51ae7e.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/zenugudikiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/alpsankhyak_form_date.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/49881996605.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/active_and_passive_voice_formula_for_all_tenses.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/dovebavisetewibajod.pdf
    • https://static.usrfiles.com/ugd/3bca44_bb75f1570a5a4088a2c7298f878a1f86.pdf
    • https://static.usrfiles.com/ugd/eb4c03_137657779fb347409344f3ede1bc2ecb.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/24748986405.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/4750943217.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/71761616904.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0528/files/cinderella_story_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/michelangelo_worksheet.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_off0000768a.bin
8028607ea1faf15d11f3099a3fb745118d82286d57d0cd329963325c59e45a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 5108 bytes
font_01_sfnt_off000087c8.bin
ed1b2cc3226814629e9d2f640ca44bfc008e9957c12c11f4994e8308ad956f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87C8 10392 bytes

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