Malicious PDF — malware analysis report

Static analysis result for SHA-256 9733cebd7d5f36f1…

MALICIOUS

PDF

39.8 KB Created: 2020-09-17 18:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ee8d9b81f8b35e52ab8a91b85def3f SHA-1: 1ca2d48d90a1b749547ae35aacdd914a5661830c SHA-256: 9733cebd7d5f36f18a50f518da1967c9e14d22904c0f66087aab884bc9fabd3b
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that is also present in the list of embedded URLs, suggesting a lure to external content. The primary attack pattern involves redirecting users through a chain of links, with the initial link pointing to a known malicious redirector.

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.club/wix?keyword=goodyear+assurance+fuel+max+215%252F55r17
    • http://reres.earringsandwhatever.com/uploads/1/3/1/4/131483348/mejuladugogixawalux.pdf
    • http://dezepe.cobrambaroogaec.com/uploads/1/3/0/9/130969336/wosawe.pdf
    • http://gumeku.darlisecafe.com/uploads/1/3/0/7/130739024/1c7fe864bb7cc.pdf
    • http://zusobelez.savannahgreendirtdesign.com/uploads/1/3/2/7/132740415/11d952812f.pdf
    • http://files.thecoolphotographer.com/uploads/1/3/1/6/131606861/d6f20962.pdf
    • https://1dfd04ee-9475-48df-898b-ff4da9ba9db9.filesusr.com/ugd/5dc3ca_59c3a74e88b6439787cf3e602602e719.pdf?index=true
    • https://59abe2c9-6941-42b4-8116-9ef58026577a.filesusr.com/ugd/a4ea6c_04929813df514dc496eb9c2d9b5a2fd7.pdf?index=true
    • https://a0ae23f9-b269-4289-bfcc-54874370e034.filesusr.com/ugd/12daa7_55187b09159d450787e19d5ff1658d0d.pdf?index=true
    • https://3757b694-0e7f-4096-9c47-c8ede6d3c5b4.filesusr.com/ugd/105a8c_3c873d101f2a452cb1ac8b005162116d.pdf?index=true
    • https://58d59cbc-53d0-433d-9184-03344228cd7b.filesusr.com/ugd/cf5aa9_b717c567b3df40d5878c2e64fb8c9a16.pdf?index=true
    • https://c7ac438a-721d-4a2f-887a-dcb47225cd08.filesusr.com/ugd/440e29_fd60beb2d8b747ac91c342b9c04c352f.pdf?index=true
    • https://f83cc3bd-7fa5-4805-beca-2ec01a659dbc.filesusr.com/ugd/9b33c5_aa160d637ff0431397c9ae7f84cf5e4f.pdf?index=true
    • https://89f1e893-f740-4195-bfb4-c522f83e9140.filesusr.com/ugd/a374b9_906f3701a48f49eea66cf91cabae0532.pdf?index=true
    • https://9405330d-86dd-4da0-bf7a-6f1dd33f9aaf.filesusr.com/ugd/baef12_616f0fa279a94298b9071d20482fe7c4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87743453122.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/xaravidomofatu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/14175166152.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_off00005a95.bin
4a8c1894db7f9b4e9a4fed682ec74df7822003075b68ecf57887f762bf608e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A95 5792 bytes
font_01_sfnt_off00006e65.bin
c47ae87959e990fcd973b4dd9d3bbe1f7533a9994936b35f771cd5a995c3388a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 10380 bytes

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