Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96a90ec37a0c6a6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 14:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d257dd3c16b5bd8404cc5e20f18c588d SHA-1: b4cb34ef4d49e47c8aacaae2ce35d1d737214225 SHA-256: b96a90ec37a0c6a6e4bcffbf9e3891d5f18420a9744d2152997a0fa2562c8c83
152 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting it is a lure for a user manual, which is then used to disguise the malicious link. The PDF_SEO_LINK_FARM heuristic further suggests this PDF is part of a larger link farm operation.

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=ge+spectra+self+cleaning+oven+owner%2527s+manual
    • https://static.usrfiles.com/ugd/b8c837_4456d4e8d39a47e0b54fa0663237473a.pdf
    • https://static.usrfiles.com/ugd/dd4472_18c243945bc945b6984d207c25a3df91.pdf
    • https://static.usrfiles.com/ugd/b8c837_85d4b6f958204b24b3f2a9278f2e0a7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d237b1638054691bbfc12eece92e935.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/30832210233.pdf
    • https://static.usrfiles.com/ugd/b8c837_42f48f3749bd4b23a784bc403d0db627.pdf
    • https://static.usrfiles.com/ugd/b8c837_76925b519f274fabb3e97b08dfb613a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_965648b0150f4fe2a9a34765e31ff998.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e001332d39b4cd69e54935833f64099.pdf
    • https://static.usrfiles.com/ugd/b8c837_9103ccc0c81647c68040e4b2ae5c9f27.pdf
    • https://static.usrfiles.com/ugd/b8c837_61dc039615f94bcd81525e48d6b394d8.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_off00006f23.bin
ab8faf33f2c972158c292ce47751d3326371a5f0d6fbc8d7fbcbf817a5f18006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F23 5552 bytes
font_01_sfnt_off00008217.bin
35ba744f18f5f460b39c0284ae1fa97866af1fd337f5554566611f88c466d146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8217 10408 bytes

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