Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be9093ac8f32325…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 11:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ee13f5a5b1ab433976cc645fe73ac4b SHA-1: 37df7c46f86ad3866a026ec3d475d25286cc4457 SHA-256: 0be9093ac8f3232516d7a62a621845434102359af629b773aabb3c6b393a569d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to link farms and redirector infrastructure. The primary malicious URL identified is ttraff.com, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF links, suggesting a lure to external content. The ML classifier strongly indicated maliciousness.

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=ejercicios+de+adjetivos+calificativos+en+ingles+pdf
    • http://files.goldandcharm.com/uploads/1/3/2/8/132814343/xojotunezenawo-pejawofu.pdf
    • http://furipa.commongroundonthehill.org/uploads/1/3/0/9/130969060/1625667.pdf
    • http://files.eurovisionequestrian.com.au/uploads/1/3/1/0/131070971/a3f30dce624b8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/fiboxabuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/bsc_nursing_2nd_year_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/32043002831.pdf
    • https://cdn.shopify.com/s/files/1/0444/8894/9927/files/calendario_escolar_2020_y_2020_sep.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/metallica_hardwired_to_self_destruct_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/6891386070.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/87317661302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3294478915.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/arthritis_research_uk_back_pain.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/infinitive_and_bare_infinitive_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/sitapakozid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/31831232901.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/29654559133.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_off00005fdb.bin
fd594a4ffc0efc4a7a4f99aeee9c9251fb4e2f941511b44523096b65d82035f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 5416 bytes
font_01_sfnt_off0000726c.bin
dc3f1f4199b55addd07245591c557d413242b70e9a912253db1c521463fb3ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726C 11392 bytes

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