Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b49b57b200602d…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 12:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e22daedbb7c901451cac8e80d419574 SHA-1: cbaec880ba1e8c46b1262adf967e4456e61fdaef SHA-256: 64b49b57b200602d14305f06b63dc1f5dd90bd5acb5d60867c6279b5b92a279c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or potentially malicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://ttraff.ru/pify?keyword=disable+bixby+android+9' as a known malicious redirector. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated 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.ru/pify?keyword=disable+bixby+android+9
    • http://files.technotoastart.com/uploads/1/3/1/8/131857199/nawetemero.pdf
    • http://files.lindseyraisa.com/uploads/1/3/0/7/130775854/pekatubojon_vamosabivob.pdf
    • http://files.oregonfmc.org/uploads/1/3/0/7/130776407/kajuwedazadepi_mogatej_jufedexim.pdf
    • http://gikonuf.isabellabolster.com/uploads/1/3/1/3/131381204/2121554.pdf
    • http://timovidix.secfmc.org/uploads/1/3/1/3/131380600/fefujixivusumigaweku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1193/8216/files/book_wings_of_fire.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/gorun.pdf
    • https://cdn.shopify.com/s/files/1/0454/3184/9128/files/consulting_invoice_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/miranugexufalugaduvidagam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/whirlpool_washer_manual_wtw5000dw1.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/bumekurugug.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/elements_of_ecology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/word_meaning_with_synonyms_and_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/29668340195.pdf
    • https://cdn.shopify.com/s/files/1/0431/5604/5981/files/warrior_leveling_weapon_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/company_cover_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/59752192910.pdf
    • https://cdn.shopify.com/s/files/1/0441/2915/7272/files/65334076997.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_off0000714b.bin
016f6b429f66729197815d8869655592304a3a1d44dea890b556ea6c75089686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714B 5284 bytes
font_01_sfnt_off0000834b.bin
eaa67de0b4ad1b03a0c789c0c6d170d371dfa27c22447ef90654af65f576391b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834B 10120 bytes

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