Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7254da9c3405e07…

MALICIOUS

PDF

40.5 KB Created: 2020-08-11 19:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f849b2c1babb3595ff4886db8ae40aed SHA-1: 225ef4f13871b9bb5d158a4d090f0f562c008b57 SHA-256: c7254da9c3405e073c0974c3af148647dad3f1bb1826839b4a73780fe3be52d7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests a link farm or phishing lure. The primary attack pattern involves redirecting users to potentially harmful sites.

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=ascensores+hidraulicos+pdf
    • http://files.kookykrayons.co.uk/uploads/1/3/0/9/130969322/4713650.pdf
    • http://xefezifit.diamondavestudios.com/uploads/1/3/2/6/132695569/f68e77ccec.pdf
    • http://files.rhondamills.com/uploads/1/3/0/7/130740349/4000646.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/30426652348.pdf
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/button_mushroom_compost_formula.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/lowes_colerain_ave.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/31516175542.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/mitotic_cell_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/ralavegawumukefegupelino.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/calculus_ii_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2775/files/sujet_brevet_2020_histoire_geo_emc.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/autarquias_locais_em_moambique.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/bajrangi_bhaijaan_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0438/3241/0272/files/96599806199.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_off00005f46.bin
1d59e5d6faf099d27502f8bc07f61934988a4ce7f099da7a7c081b4d8ddd6b03
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F46 5232 bytes
font_01_sfnt_off000070fd.bin
608fe45b4d41d49728cc211dacab3643cc53bc0868d4636923a1bbb67446644b
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FD 10868 bytes