Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d467a28cd7b0b15…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 09:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a423b294b54e0a2b39ea4d52c6a7dc18 SHA-1: 32a10ace065bbd8f47356d56707d6ccb6b6901a2 SHA-256: 6d467a28cd7b0b157d0354e4bc51da289296bd2ebacf75a12ce7c5eda1a2b24c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a redirector service, which is a common tactic for distributing malicious content. The document body and heuristics indicate a lure for a 'free PDF minimizer download' that points to a malicious URL. The presence of numerous links, many pointing to Shopify, suggests a link farm used for SEO poisoning or traffic generation 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/pify?keyword=pdf+minimizer+free+download
    • http://files.scrapthetrappgh.org/uploads/1/3/1/0/131070030/jakejixasededabulajo.pdf
    • http://files.ignitecities.com/uploads/1/3/1/8/131856456/4e124e1f02f5016.pdf
    • http://files.jciparma.com/uploads/1/3/2/6/132682833/duzararolajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/jutogasudilutunukezemipos.pdf
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/java_foundations.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/yuna_crush_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/2944/7335/files/panefipupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/lamopuxerageluxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/computer_lab_technician_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/dafilorupozax.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/80664950649.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1130/files/jetikugevekuxijoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/kiluj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/91086975607.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/25667876057.pdf
    • https://cdn.shopify.com/s/files/1/0437/4023/3880/files/xapulotupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/lemanonijukugateware.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_off00006298.bin
eb9ad7df4d2841d74e21ef6fd11fc722452ba25253ae00c3ebad29f54c6b9dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 5020 bytes
font_01_sfnt_off000073ab.bin
4e9aa1cf4b21af61e53c4ed921fc72022b5e5b70a03e357d571afca1774cc711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AB 10112 bytes

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