Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18dd59375dd91db…

MALICIOUS

PDF

39.8 KB Created: 2020-08-08 06:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ed6d2d52460b7d9f5970a0242a1811e SHA-1: d3af7fe9a64fb0d2533b9802e6321c5f492cb7e4 SHA-256: e18dd59375dd91dbc04ae44e9b334672205cca8e79eea47ec043780ea429beb2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wb?keyword=derecho%20civil%201%20pdf%20argentina, suggesting a lure to trick users into clicking on links disguised as search results for legal documents. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=derecho%20civil%201%20pdf%20argentina
    • http://files.dwdixonsaddles.com/uploads/1/3/2/6/132695372/liwesipixaxi.pdf
    • http://files.uconnphideltatheta.com/uploads/1/3/1/4/131407364/lixinevebitajaz.pdf
    • http://files.stephenskitchenandcatering.com/uploads/1/3/1/8/131871864/pejirezev_pikoreso_buvivigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/lurifagimixozabedeteb.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/bach_barenreiter.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/drug_induced_liver_injury_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3709/files/teacher_interview_questions_and_answers_tell_me_about_yourself.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/60237091723.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/84940562709.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3097/files/dolarosologaxixizabuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/vagavibumowetikebajoz.pdf
    • https://cdn.shopify.com/s/files/1/0450/2369/0916/files/2020_kpss_vatandalk_video_ders_notlar_benim_hocam_yaynlar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/cyanogen_13_nexus_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/nowexojidumiwavito.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/wosogowu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.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_off00005b8b.bin
b00d27d9e1d84e242fedbd6c0a6730ae3e464c846704e2d2aeb73fcacb60436b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8B 5348 bytes
font_01_sfnt_off00006dce.bin
3bc0552e0688fa3e9215de146406bb60e52b846938d899271ee6ffe2718f7f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCE 10820 bytes

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