Malicious PDF — malware analysis report

Static analysis result for SHA-256 8764fed91cb447ac…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 02:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17d6f34d88cdc8a7c28db912741a43e1 SHA-1: 162a544b3485f88793282f21e559ab3062081ace SHA-256: 8764fed91cb447acb25cef7a3ae63a83fbc4eb303e09820f8bab7b8ab0f9be24
152 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 external PDF files hosted on Shopify. One critical heuristic firing indicates that a link within the document redirects to known malicious infrastructure at 'ttraff.cc'. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=binomial+distribution+exercises+and+solutions+pdf', suggesting a lure to download or view content related to binomial distribution exercises, which then redirects to a malicious site. 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/pify?keyword=binomial+distribution+exercises+and+solutions+pdf
    • http://files.cycotron.com/uploads/1/3/1/8/131857920/6612e0.pdf
    • http://files.fcapc.org/uploads/1/3/1/3/131380146/mawewaj.pdf
    • http://files.fullspectrumdoulacircle.com/uploads/1/3/2/6/132681033/3784977.pdf
    • http://files.libertyppg.com/uploads/1/3/1/8/131856632/6874170.pdf
    • http://files.fourcornersveterinarysymposium.com/uploads/1/3/1/3/131384573/b59ad5a0c3c.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/61751780404.pdf
    • https://cdn.shopify.com/s/files/1/0440/6755/3430/files/64817816197.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/c_language_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/pepuboxoriwosetubilaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/bodewiwagobuzenupuvotuwif.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/97519311845.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/msi_afterburner_fps.pdf
    • https://cdn.shopify.com/s/files/1/0440/1148/7397/files/should_ve_said_no_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/karepekozoturazowofamegul.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8039/files/2020_porsche_cayenne_turbo_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/22590571164.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_off00006311.bin
4c04259e47e4f4d553e4aa74d99c7128e22ea93966a14b23560c22573fbd9372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 5556 bytes
font_01_sfnt_off000075d4.bin
2715b3f1f5a782a2ea71864587b4ef690376de827f01fd1284b2304bf59e8a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D4 10944 bytes

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