Malicious PDF — malware analysis report

Static analysis result for SHA-256 0653bd4786ed1dd7…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 13:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb14c632674706672aa68cb5ecb707e5 SHA-1: bb1ffb998a911e32f18d49ba7ba8c76838dbe6bf SHA-256: 0653bd4786ed1dd79ebecbe604dd9851cfc80efab324d87b0efc04a713c21f9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a game download, but the embedded links point to a malicious redirector and a large number of other PDF files, indicating a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL used to obscure the final destination.

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=fancy+pants+adventure+1+for+pc
    • http://files.annryalsart.com/uploads/1/3/0/7/130776726/bc21b35d18.pdf
    • http://losevile.dalestourism.com/uploads/1/3/1/3/131381204/deec3ce0.pdf
    • http://sepupugo.neukappadelta.com/uploads/1/3/0/8/130814397/2566405.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/bmp_to_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/74212993859.pdf
    • https://cdn.shopify.com/s/files/1/0449/9347/8814/files/roy_baumeister_willpower.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/catalogo_viemar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/all_human_body_systems_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/aero_hydrodynamics_and_the_performance_of_sailing_yachts.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/mri_brain_atlas_and_text.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/83565370687.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/jipomasixunodokomebapov.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/bilel.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000583f.bin
fe7d4870d4a06ea4049b7978f64d0f51ba4aa36f6874189bea1ffedbf8eb95c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583F 5288 bytes
font_01_sfnt_off00006a5c.bin
050ca490cfe0221db703be2b56b248808d4f727e0012afee078a43e3c318a747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5C 10308 bytes
font_02_sfnt_off00008dd9.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD9 16312 bytes

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