Malicious PDF — malware analysis report

Static analysis result for SHA-256 280aa22eace66a7e…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2302e8c4eeceda49e04e8c5074ac3274 SHA-1: fc987206986776a6c23ed062585b4d28716ac8c9 SHA-256: 280aa22eace66a7e4f7a5eb024947b3cfff196545cfdbb9df40d7a29b6a312e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify and static.usrfiles.com domains, likely as part of a link farm to improve search engine ranking for malicious content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=secret+the+power+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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/wix?keyword=secret+the+power+pdf
    • https://cdn.shopify.com/s/files/1/0435/0889/1807/files/30543024225.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4293/files/csgo_autoexec_location.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/tefovoponoxamabogibigu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/didifawogokitagefinod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/84106877289.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b90e902b8b4aa9ade104185c577f00.pdf
    • https://static.usrfiles.com/ugd/b8c837_feeda288822742148fcb0f58dd7efac9.pdf
    • https://static.usrfiles.com/ugd/b8c837_255a84215a284ca88d45dcb08a210a2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd91bdfa4a34bb08d5d7f50363254dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f8b68fe90ae4f82ad38b3d9843c69e4.pdf
    • https://static.usrfiles.com/ugd/83f04e_47197f37b794424cb1ccbb38dd3a2f9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_38e3b4eab8184bb18eb1994d489493f2.pdf
    • https://static.usrfiles.com/ugd/57c819_07e9b79f43634a4c94ab3fc27ed84d0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc3e5999a7de4cafb3d8ed7e44dd68bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f3c77502bd8481685a7886b86258d2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_01997eb66f384cb2b5483b4ff4489c7d.pdf
    • https://static.usrfiles.com/ugd/c63dba_3e54276dcdea4b7fb35547944486d898.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_off0000658c.bin
4fb9e4dd8b0eeaba762418bd63cdb88ecf0c82f978ea2eec4a4e62d30757f096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658C 5016 bytes
font_01_sfnt_off000076ac.bin
5de8c6a1a6a61b12e1d2af3e6c3802d9694151521994c7ae0ef453a74ff3f2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 10060 bytes

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