Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b69bbadc8203d1c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 22:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9296a0594d1ec52f10cb1d2e34fe10 SHA-1: d62b13a4e9a50105f345a6c053cf165ca22ada9f SHA-256: 4b69bbadc8203d1c3193517dc464ea374df3a631395a6b850fd73bb9dba65f11
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'https://ttraff.com/wb?keyword=transportation%20theme%20worksheets%20for%20kindergarten'. This URL is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains embedded URLs that point to various PDF files, suggesting a link farm or content distribution mechanism. The ML classifier strongly indicates 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/wb?keyword=transportation%20theme%20worksheets%20for%20kindergarten
    • http://xuxoga.kimberlyfogarty.com/uploads/1/3/1/4/131407406/3743537.pdf
    • http://keritabuf.christine-rothwell.com/uploads/1/3/1/3/131380177/zeponuzidixe_topelovapo.pdf
    • http://files.expressionsofvoice.com/uploads/1/3/1/3/131378776/xavipev-raguxizusor-naxarevuvap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/ratemajosisog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/group_problem_solving_activities.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/didegesubusavofejaze.pdf
    • https://cdn.shopify.com/s/files/1/0451/7340/7893/files/87105276093.pdf
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/rolalulisogupifof.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/du_migration_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/alphabet_braille_franais.pdf
    • https://cdn.shopify.com/s/files/1/0449/8394/3326/files/el_libro_apocrifo_de_juan.pdf
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/lonibelafawajagefov.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/sujekutaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/cancer_definition_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/2335/0434/files/gofovudavuzakudenopu.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_off00005f92.bin
18024c228a1d9e01facb7cc56af49b44ee7edc36b02be8f69d66ee4bd8f3c77e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 5316 bytes
font_01_sfnt_off00007187.bin
881c63954bc768799bf002e4ff414d76d8a478e85c52ee10140706d2a7b59ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7187 10000 bytes
font_02_sfnt_off0000938a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x938A 4324 bytes

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