Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3333de0ad0bf86…

MALICIOUS

PDF

47.3 KB Created: 2020-08-29 16:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c64922a757aced5da9d51d2fd90861 SHA-1: 0c7a5f47cc3187a4f70b768d91d566140798f366 SHA-256: 1c3333de0ad0bf86a31affed152108999d32008aef100b073031663f4fd94106
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, another critical heuristic identified it as a PDF SEO link farm, containing numerous external links. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body contains obfuscated text and URLs, including the malicious redirector URL.

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/wix?keyword=spanish+verb+conjugation+chart+pdf
    • https://static.usrfiles.com/ugd/b8c837_4b5e280cb0054cf3b2372c6986aacf90.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbbd5f0e68a4e4d8a973a8d228d58dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_70a1ffe7f8bc4e2f9c2a1297548aa03e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5751e6bda844f2b8fa809d0d9be069e.pdf
    • https://static.usrfiles.com/ugd/b8c837_564a652eb83b4f5a923aa5e0bee86d9a.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/auditoria_financeira_exercicios_resolvidos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/57332297903.pdf
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/kixudiwimozafodupirurowo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/kamala_das_my_grandmother_s_house.pdf
    • https://cdn.shopify.com/s/files/1/0461/6916/1880/files/79816159886.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3671/files/necronomicon_the_anunnaki_bible_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/98626004969.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/pump_selection_guide_grundfos.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/72868348407.pdf
    • https://cdn.shopify.com/s/files/1/0450/9224/1560/files/xufevimowikosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/nec_phone_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/77687030874.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/chiari_malformation_surgery_length.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_off0000785d.bin
266cc0a48ec613df3a4f69e6dee3ba97ab928ff94335d9ec7d1a2e7bf13a5fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785D 5764 bytes
font_01_sfnt_off00008bea.bin
11a814e3281cf65ce61b0c1cba39c813d5c98f6fcf50c66cf6ee622278f8663b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEA 10580 bytes

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