Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dad8cff01d394fe…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ee483b63b117270be727ee9c5968d68 SHA-1: e8ecc7479c90effe58130cd137b4ce37b7533349 SHA-256: 5dad8cff01d394febe6566d624e42e241d5c13ddcfb5f650f8aa193b91b89184
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=proportion+and+non+proportional+relationship+worksheets'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of this link farm.

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=proportion+and+non+proportional+relationship+worksheets
    • http://zaruf.posterworksgallery.com/uploads/1/3/1/4/131406749/4a51cbf09320.pdf
    • http://files.catfishhox.com/uploads/1/3/1/4/131453005/vutesag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3751/6191/files/jugopara.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/87530861362.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/marathi_kadambari_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/kotavizebazezekupogoneda.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/66542763159.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/xexamageluvuvaxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/mujoxogigidazunimibafes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/laporan_pendahuluan_hernia_umbilikalis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6325/files/14827652311.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/siparudaxub.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/kevujavubuwosiva.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6469/files/tozomefop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5452/files/inventory_count_sheet_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6774/files/merrill_physics_principles_and_problems.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_off00005edd.bin
ed9ba8dd72c429023f9c9685db4218219c12da6aac5ea9b7bb4a762b61b61902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 5204 bytes
font_01_sfnt_off0000708f.bin
b5a9e86d2fd9371c4c1f271484ac336fcca278e824be7701dc45bfba64b65b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708F 10292 bytes

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