Malicious PDF — malware analysis report

Static analysis result for SHA-256 833291520a3b967b…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 13:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78c9a47021f0b0e28c9b517bae53735b SHA-1: 67a9a8e84386912e8e8cd0a7adfc4b9474b7e45f SHA-256: 833291520a3b967b116b840b5bf2dc1c8e8f122a50152a5ddd476d6234171825
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=maths+worksheets+year+1+nsw'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content under the guise of educational material. The ML classifier strongly supports the malicious verdict.

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=maths+worksheets+year+1+nsw
    • http://files.dpnutritionandfitness.com/uploads/1/3/1/3/131379980/wojoboda.pdf
    • http://files.aliawalston.com/uploads/1/3/1/6/131606815/levupuxupoj.pdf
    • http://files.timberlinelearningcenter.com/uploads/1/3/1/6/131637177/gimefejaxulaxafasuxe.pdf
    • http://mikotona.ecopdx.com/uploads/1/3/2/6/132681352/xobemexer.pdf
    • http://vubudinij.openhandstrust.com/uploads/1/3/0/8/130873947/pusimewuje_soligive_luwalabote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/centroid_formula_for_different_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/75025951551.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/74573963687.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/33224359555.pdf
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/isc_class_11_biology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/58889918103.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/lerefanin.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7463/files/here_i_am_lord_hymn_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/kitchen_aid_dishwasher_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/6501/4432/files/zombie_catchers_mod_apk_new_version.pdf
    • https://cdn.shopify.com/s/files/1/0438/4319/0944/files/problem_solving_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/grade_10___12_mathematics_textbook_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/dubem.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/59835890153.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_off00005db9.bin
b32f6e143c79daecf2ef204151f990d684a80d6e3aa5d6954a3be1abc40c38b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 5056 bytes
font_01_sfnt_off00006f06.bin
f0e045e89dcb5f9ead01837cf41c058802836e4a38fa0baebc0c4dedda394c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F06 9848 bytes

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