Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4973b9293c015a6…

MALICIOUS

PDF

38.4 KB Created: 2020-08-30 21:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8730d5595ee13a9b59b8238fc371a54 SHA-1: 1ec8c4a8ad6a345445463dd78d612701f075a46f SHA-256: f4973b9293c015a678ce2913e3aadfad77cba690b047c4e68015fe26326850f3
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same search query as the malicious URL, suggesting a lure. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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=bosch+macurco+d381+air+quality+detector
    • https://static.usrfiles.com/ugd/b8c837_f41429a1127d412aaa97870cbc82fe1f.pdf
    • https://static.usrfiles.com/ugd/353d00_1f0aa5eb81e74ca6a136c0328d68ef59.pdf
    • https://static.usrfiles.com/ugd/3e9e83_41dd30ee62414210abcad4019422fa70.pdf
    • https://static.usrfiles.com/ugd/7dd30d_66c689dc0fd044a59aeb053794fb8a3e.pdf
    • https://static.usrfiles.com/ugd/12dc78_5d9f72b4ca4f45b2875b8968ad4f3927.pdf
    • https://static.usrfiles.com/ugd/cac9e4_9fab6fc84d2a4687b89525a833f81de1.pdf
    • https://static.usrfiles.com/ugd/b8c837_52cc22bbb8c04c398fb28627c88c81bb.pdf
    • https://static.usrfiles.com/ugd/d1c05f_7186a417d1ea4ee1abea6afc3a1cfc47.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ee8675375dc43979a5a34d93c91d2d8.pdf
    • https://static.usrfiles.com/ugd/affb4a_cdb79c28408d4efdb0b41162bd967863.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/jesumiwakodujeduluwoke.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/68055023389.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_off0000565f.bin
c944b26e6b6e211d1184d09a34ea64327ddafb5c26d154bb42b610fac977c5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565F 5864 bytes
font_01_sfnt_off00006a31.bin
170422fc013ab83a3b589970a17e00055048667f7d3b7b3c4ae9d532fd8950a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A31 10004 bytes

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