Malicious PDF — malware analysis report

Static analysis result for SHA-256 e446780f08846180…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 02:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ecbca45c578c5ab0b9063f375df1ae SHA-1: 3487849b03763bedf5e479ab63ff6c2f60f3b05f SHA-256: e446780f088461809c1fec1adc738e4cbfad6ab4193da6b5bb6c54511832ab98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to appear as search results for educational materials, such as 'abrsm grade 1 theory book pdf'. This link redirects to malicious infrastructure at 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify domains hosting PDFs, suggests a coordinated effort to distribute malicious content.

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=abrsm+grade+1+theory+book+pdf
    • http://files.upsilonmudeltas.com/uploads/1/3/0/8/130814596/zodasakogaf.pdf
    • http://files.thesovereignspirit.com/uploads/1/3/0/9/130969003/8c0912dc.pdf
    • http://files.vvsahs.org/uploads/1/3/1/4/131483307/kafinokejuse-wigixofokip-niporagapaw.pdf
    • http://files.tombstonevendetta.com/uploads/1/3/0/9/130969448/3bf179e011697.pdf
    • http://files.edromancounsel.com/uploads/1/3/2/8/132815220/3342977.pdf
    • https://gb.abrsm.org/e
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/vi_delete_all.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1067/files/21399626000.pdf
    • https://cdn.shopify.com/s/files/1/0439/2737/1931/files/kuwijovuxosaperojuvif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0325/6737/files/cementing_materials.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/52751258397.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/fajidelefezore.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/joned.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/fobukuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/collaboration_diagram_for_library_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/nanubatub.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/screen_quick_reference.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/diwelomewuvimo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c3.bin
7e433c42466c603dd72f7a44a6b7ae5e3f61d49240e2a0d51c75a80e5d024af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C3 5768 bytes
font_01_sfnt_off00007848.bin
29e2a0f2a1db8f8d1a3058b3bc7a43694060f8e8308afad15ebea3368936acd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7848 10248 bytes

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