Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28514a50a292f8a…

MALICIOUS

PDF

44.8 KB Created: 2020-10-19 06:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27fd72a2d007efbc80675498fd09eb08 SHA-1: 177b15f0c0710789e079fc6cb68fa989a0bb89ff SHA-256: c28514a50a292f8aa798b89c437cdcfbc8be52d04ff885e1808864a850a203b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.me/123?keyword=healthy+ketosis+and+intermittent+fasting+book+pdf', is designed to lure users to a malicious site. The document body, though heavily obfuscated, contains references to the same malicious URL and benign-looking PDF filenames, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

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.me/123?keyword=healthy+ketosis+and+intermittent+fasting+book+pdf
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/towuminigopubilezi.pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/tobonatupekimimabuf.pdf
    • https://uploads.strikinglycdn.com/files/5af83514-e60a-4b36-89a1-7d9ac6794c2f/junaxeravozenapenile.pdf
    • https://uploads.strikinglycdn.com/files/f1de54d9-c67e-4b7f-bd8c-6bc51396b0d2/3008268946.pdf
    • https://uploads.strikinglycdn.com/files/ad4ec2b0-72fd-428c-9958-8f79546d5026/nebifojazojito.pdf
    • https://uploads.strikinglycdn.com/files/c08a5baf-dea7-4760-a5db-a54dbbcadb67/renuwodoguxugotozir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6897/2444/files/49335141452.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/underhand_app_guide_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0500/3499/9446/files/67401282886.pdf
    • https://uploads.strikinglycdn.com/files/66b9f08f-848b-43c5-86f5-d74aa03af62b/43826575528.pdf
    • https://uploads.strikinglycdn.com/files/c39133e4-38d2-404c-8e4f-a2760a239436/gitabilowumazoneluriwom.pdf
    • https://uploads.strikinglycdn.com/files/cca715c2-f42c-494b-b8b7-41a832d13941/piwujelotirelimozedi.pdf
    • https://uploads.strikinglycdn.com/files/baecdba9-ee5e-4788-9b30-d9d1356d5822/14992741522.pdf
    • https://cdn.shopify.com/s/files/1/0500/3866/9510/files/lexus_club_rangers.pdf
    • https://cdn.shopify.com/s/files/1/0488/2392/6949/files/ncert_11_maths_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0496/4469/9799/files/makita_mac700_vs_mac2400.pdf
    • https://uploads.strikinglycdn.com/files/c0132005-7e70-46c6-b805-c5d77a858b93/mario_bros_en_cuadricula.pdf
    • https://uploads.strikinglycdn.com/files/f9a80a42-a5bf-493a-9f9f-5ecd103cf20a/vopefitunudide.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_off00006fff.bin
d51084f1fa8cc094a4f86c143b819e78952d5da7ebeb58c310d0ad69d3da315b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFF 5720 bytes
font_01_sfnt_off00008348.bin
1887747d653a2fd67645aedc4e334fb3d4d866b5e83f1654325030461cf81b5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 10144 bytes

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