Malicious PDF — malware analysis report

Static analysis result for SHA-256 49944f534997770d…

MALICIOUS

PDF

59.6 KB Created: 2020-08-14 05:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb2093270851391ef161ff26b3a82a8 SHA-1: ef248fcd6c94d42dbf8bf055b2423f17e0046c8e SHA-256: 49944f534997770d69c4e2595682a75672ecf97c389af820485f54d1a7298ee6
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=kramer+via+campus+datasheet', is identified as a malicious redirector. The document's content, though heavily obfuscated, includes this URL and other Shopify links, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=kramer+via+campus+datasheet
    • http://files.inekemacnab.com/uploads/1/3/1/4/131453543/2589407.pdf
    • http://files.alohaestatejewelry.com/uploads/1/3/0/8/130873877/b366ce9.pdf
    • http://files.connectpreschool.com.au/uploads/1/3/1/6/131606073/c4bac82337d.pdf
    • http://fulej.genewhitacrecpa.com/uploads/1/3/2/3/132302939/9152a1eda5de.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/common_interview_questions_for_teachers_and_how_to_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/8771/5742/files/eugene_hourly_weather.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/cambridge_english_readers_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/saloxatuwanararaxa.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/cambridge_igcse_business_studies_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/payroll_management_system_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1699/files/99117617843.pdf
    • https://cdn.shopify.com/s/files/1/0440/7672/8485/files/pilot_interview_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/8451619275.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/9099140053.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/jackson_a_user_s_guide_to_principal_components.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/39129267274.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5110/files/.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007035.bin
ce0b152047b19c4b40460fd03ff25cc5397d93809a376eff5889d8791960f02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7035 4976 bytes
font_01_sfnt_off00008119.bin
6de5fe77ee7ec02dc058f0151adfad9c0080604316688ba236d4a143377cd3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8119 11452 bytes
font_02_sfnt_off0000a167.bin
71a07cc0feaf1b3a36d8bcaa0263bef3a7404d7e4b56bcbde57f361b31997ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA167 15260 bytes
font_03_sfnt_off0000d086.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 4324 bytes

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