Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4250ae2efd83824…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 03:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22b79e94cb32f5c3a2ffef8eb32321af SHA-1: 0f98505ee8419428736723ca9a9542b660242e0f SHA-256: a4250ae2efd83824fd0b017621bb8b25965dccd8638f051d80f10332bc8bbee8
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many hosted on Shopify, designed to appear as legitimate documents but ultimately redirect to malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=odisha+tourism+pdf, which is flagged as a malicious redirector. The document body itself is heavily obfuscated but contains embedded URLs that are part of this link farm. The ML classifier strongly supports the malicious nature of this PDF.

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=odisha+tourism+pdf
    • http://files.mjuniquedesignz.com/uploads/1/3/1/4/131453255/nigibejer_wesuviluwenetu_rebadumato_mojadilinoda.pdf
    • http://files.yogashak.com/uploads/1/3/0/9/130969910/zevuru.pdf
    • http://files.writespacehouston.org/uploads/1/3/1/4/131406518/7438185.pdf
    • http://jokom.karraschconsulting.com/uploads/1/3/0/7/130740072/2523507.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2664/files/fujanuvezofotakajafager.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/computer_binary_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/6417/2445/files/vusojivudabizomekirefegim.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/a_cappella_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/0448/3993/files/givunowefonosojofofifofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1003/9719/files/derezadawup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3978/4103/files/nikopekinozozoroja.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/nijerifupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/1207171100.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/bike_authorization_letter_format_west_bengal.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/76426874941.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/42874094393.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_off00006be1.bin
27a36b72788c0f89b446738f0764fef5fbc9361a39632dc93137ebeac795074b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 5276 bytes
font_01_sfnt_off00007da3.bin
eddfc460764bca85ea6f7e44e337e60f03c60e977e063845065860c367330892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA3 10048 bytes

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