Malicious PDF — malware analysis report

Static analysis result for SHA-256 fceb1fa4c9f507f7…

MALICIOUS

PDF

32.6 KB Created: 2020-09-20 22:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18cfd5b577abad3d492bdb96f10462eb SHA-1: a9b8a39635458163d88e824f90eb6a288df50ad1 SHA-256: fceb1fa4c9f507f720893a67a7e6ed056d805ee1d9b76977d6eb8461d4323770
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or redirection attack designed to lead users to malicious content.

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.me/wix?keyword=sadlier+vocab+level+h+unit+10
    • http://files.3nchallenge.org/uploads/1/3/0/8/130874533/rofej.pdf
    • http://files.artarmonphysiotherapy.com.au/uploads/1/3/2/7/132740694/nomojiwixop.pdf
    • http://sekab.slfexhibition.com/uploads/1/3/1/6/131636746/a60dcf18e9f74.pdf
    • https://99c91d38-0342-40bd-a5a0-1b1cd0eb4863.filesusr.com/ugd/9edd50_7dd0a656d95140a5815e9c2d0c7de148.pdf?index=true
    • https://56bd5f50-d1f8-44e7-8b04-d7a3df5e99d4.filesusr.com/ugd/d61b30_fb4d1b09b0f74ddbade4152aaec113ff.pdf?index=true
    • https://27b94c22-4979-49f2-a034-d7d7deb02fed.filesusr.com/ugd/3ed44c_da13a7c440db4805a128a87fef2da3eb.pdf?index=true
    • https://7f1185b6-dc44-4205-82ce-ae6cffac92bd.filesusr.com/ugd/0ebc1f_cb2aa303144d43ecb52dd913ec595944.pdf?index=true
    • https://8188eb9b-49a6-4e6f-9f66-f79ae5ffe500.filesusr.com/ugd/e2b09b_9c024090b508476cb90c58e5a318385c.pdf?index=true
    • https://f189072d-148c-467d-90c4-2c35722600cf.filesusr.com/ugd/f6336d_55f3362d7bd44ac986ce1a553d1f3556.pdf?index=true
    • https://5debcf0a-84ee-4244-bd92-e5d81e26011c.filesusr.com/ugd/b90ba1_981d0292436c4395922388960bf9f97a.pdf?index=true
    • https://fb9b4255-7846-4b8a-b8e8-9365ff5e1982.filesusr.com/ugd/dcc11b_728784204165415fab15801f77b65f4f.pdf?index=true
    • https://1cb65cd9-53cb-47e1-83f0-d09201b9a992.filesusr.com/ugd/3cb6cb_39c84bdf1ea644339942178a3f5a5295.pdf?index=true
    • https://f6fd3ed2-f801-4a25-8d4e-d281fbf1796a.filesusr.com/ugd/bc84a3_7962d9e6b3c04b048a300cb46133f0c8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/34384427791.pdf
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/bofapepuk.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/
    • https://f6fd3ed2-f801-4a25-8d4e-d281fbf1796a.filesusr.com/ugd/bc84a3_7962d9e6b3c04b048a300cb46133f0c8.pdf?inde

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000473b.bin
80e804bcda0ebf16616497f188b62e39b1a02ed792b4a7e6896a46e30e548019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x473B 5348 bytes
font_01_sfnt_off00005967.bin
d2baa4693ea0a99d69043b2af569c3688f50d323b9cf1b7e797b426833f78f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5967 8412 bytes

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