Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3908713eb9fb05…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 08:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 980db0ef8c9a4ffc86e954314d2ff843 SHA-1: 10dc11540e7dace74a2a19dc8ad815635df38881 SHA-256: 5b3908713eb9fb05eeff041b0340b13aaaabf9265a333d9a5c412b93d2919301
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is https://ttraff.ru/wix?keyword=ba%25C4%259Flama+metodu+pdf, which is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious 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.ru/wix?keyword=ba%25C4%259Flama+metodu+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5b9365_5da4a5de21be4c57bfde4fd4e0dcd5c1.pdf
    • https://static.usrfiles.com/ugd/aef5b7_922e16cd08554448af668c45b810d808.pdf
    • https://static.usrfiles.com/ugd/4dd980_08d0027c166e4e87be9da24e87de2da7.pdf
    • https://static.usrfiles.com/ugd/a86d68_af78792edf9647cab63cbe4b5ca57895.pdf
    • https://static.usrfiles.com/ugd/b8c837_9152adba514f4e8fa39da77a059d4bd7.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_b6baa78bf26745ff9068faf8ea2f4ba4.pdf
    • https://static.usrfiles.com/ugd/0d002d_bc8af9b18fad4b7ab6f62c5953c23a27.pdf
    • https://static.usrfiles.com/ugd/90423f_0f634e96118c47b3bc1bba434fe27af0.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/play_store_games_free_fire.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/microsoft_access_programming_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/8701/8649/files/97311578679.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/farizakevakugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/zejewi.pdf
    • https://static.usrfiles.com/ugd/a86d68_fbd12066ad87445096d38c08a5522813.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f92c65d7a024e6a8718f26566f71acb.pdf
    • https://static.usrfiles.com/ugd/de02f3_2e2acafcfb2f4168b875a9f7e5fe647c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a738bd1569b4c1b8ac1690591a78efb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e10.bin
5639ddc63746f58f6ec7e39fd0a383190f2a85a3a14a786494561716a1d81fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E10 5192 bytes
font_01_sfnt_off00005fb2.bin
69cb2c8006029b66ca5833e559cf8b09f502ae34fa38418078b150f670bfb4d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB2 10156 bytes

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