Malicious PDF — malware analysis report

Static analysis result for SHA-256 23076923fc64739b…

MALICIOUS

PDF

41.7 KB Created: 2020-08-19 06:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 213b8bc7ca5910cd97c7b3d31ef913d1 SHA-1: b85758edd60ff3dedbdd35c774b24653b71071a1 SHA-256: 23076923fc64739b317b02ec307ae3cbedb7e0628d3da5bce35ea0bb3d1d32bc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains text referencing 'World cup match time table pdf' and the malicious URL, suggesting a social engineering lure. 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.cc/pify?keyword=world+cup+match+time+table+pdf
    • http://files.migrainepro.com/uploads/1/3/0/8/130874012/e87fd6c07bd83.pdf
    • http://files.newreach.com/uploads/1/3/2/7/132712080/7120797.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/angular_6_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0369/6536/files/java_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0439/3087/8120/files/calibration_technician_resume.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/brachiaria_brizantha_piata.pdf
    • https://cdn.shopify.com/s/files/1/0430/8031/9130/files/addis_ababa_city_administration_housing_agency_condominium_winners_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/zumofobajotimuxidebir.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/96124477395.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/algebra_equations_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/countries_of_the_world_and_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/52387478714.pdf
    • https://cdn.shopify.com/s/files/1/0451/3798/5690/files/strategic_management_decision_making_process.pdf
    • https://cdn.shopify.com/s/files/1/0438/3971/7538/files/how_to_search_sheet_names_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/gmat_full_form_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/0532/1109/files/gikibiweworigidekegone.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_off00005bdf.bin
ac1970e2e0dbb9041035154314eba1faf67d31fd122067ad548450e876b9b2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDF 5372 bytes
font_01_sfnt_off00006e05.bin
a484b3814a0f52811629c586d4573fc91b66ad32e6ebb1398dacc30abf55412e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 14232 bytes

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