Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b4d4823f8e75c4…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 20:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bff991ed3c43d25f76658fa03ea09872 SHA-1: fdcdc032f487bfc4a760dce2003c6474dca86d07 SHA-256: 74b4d4823f8e75c455d85f840ea44b98369691fa37990dfa0022239313f55fcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=cinquenta+tons+de+cinza+livro+pdf+gratis'. This suggests the document is designed to trick users into visiting malicious infrastructure, likely for phishing or malware distribution. The presence of a large number of external PDF links further supports a link farm or redirection scheme.

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/pify?keyword=cinquenta+tons+de+cinza+livro+pdf+gratis
    • http://files.luxaeternasolar.com/uploads/1/3/0/7/130775108/nipusenivobe-kipazimunika-jokiwoxenes-lamemasuxoru.pdf
    • http://files.centraleastwoodrugby.com/uploads/1/3/0/7/130776485/0237a15ab.pdf
    • http://files.thechosinspain.org/uploads/1/3/2/7/132710676/furibute-mepilemobipasor-rixotedofofemut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/24817491815.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/logiwerepovufurunoxezeto.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/geruwitinerujezejat.pdf
    • https://cdn.shopify.com/s/files/1/0439/4106/8958/files/reloading_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/pdf_file_compressor_software.pdf
    • https://cdn.shopify.com/s/files/1/0451/9405/1735/files/nuzufe.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/jiporarividutaboruzogami.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/wimomafonaxozolalasus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9843/9837/files/retitolafofevixo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3948/2278/files/atividades_de_alfabetizao_2_ano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/18655397162.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6262/files/juxemin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5406/4028/files/wukobekagedogupewir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/agronomy_guide_for_field_crops.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601a.bin
02add13355263c586c13ce79298a21480b4480d085d46c9ffc05eab62aa72b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601A 5464 bytes
font_01_sfnt_off000072c5.bin
3e9f5083d8fefe91e489cc1c3f46071e35dc0204a143f91309cfe7fc1b52a6d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C5 12336 bytes
font_02_sfnt_off000098b7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B7 4324 bytes

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