Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4efd8a470d85f3…

MALICIOUS

PDF

41.1 KB Created: 2020-08-16 00:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b5a7ad0bd372c414440b11e59e7b41 SHA-1: e0a46602e10561b32352c094c828b465a0b71d9f SHA-256: da4efd8a470d85f33bcf52acbec1f0698791d3f79da23636fab3758426fa65ce
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=synonym+worksheets+for+1st+grade', which is flagged as malicious. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious sites. No scripts were extracted, but the presence of the malicious redirector is a strong indicator of malicious intent.

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.cc/pify?keyword=synonym+worksheets+for+1st+grade
    • http://files.vipatacticaltraining.com/uploads/1/3/0/7/130739180/rojak.pdf
    • http://files.beautykonstanz.com/uploads/1/3/0/7/130775828/suximilep_wajatazukag_pabinazipobem.pdf
    • http://zafuwuri.mahlakiyaelblida.org/uploads/1/3/0/9/130969772/zilawiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6647/4139/files/tijepevoxijod.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/10th_grade_spelling_bee_words.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/jibiparo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/97124673011.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0433/2391/6443/files/neurological_physiotherapy_a_problem_solving_approach.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/java_developer_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7387/1767/files/wiktel_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/geligup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/35891441126.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5129/files/pdf_approximation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/govilulujowakav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054da.bin
c6e5449bfc56293d4bb624c3ded2a621914ba3f2899ed94240c8d4a2bf07ed24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54DA 5440 bytes
font_01_sfnt_off0000673b.bin
6f90696345251eb38274d7a9426b9bcf87f6759ed1aa8d5451b7c1d27a21db20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 9936 bytes
font_02_sfnt_off0000893a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893A 4324 bytes

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