Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf303f18bc2e31fe…

MALICIOUS

PDF

50.1 KB Created: 2020-08-01 12:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 224bbc60732dca8f16c59e58abadea3d SHA-1: 81f0d047c1cda4fddefef8f39f15ae76e85ab1ea SHA-256: bf303f18bc2e31fe30be76e1def48260631ddaaa25c44fbd2301fa69195f47a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a lure to install a browser extension or update, which is a common social engineering tactic. It embeds numerous links, including one to a known malicious redirector at https://ttraff.com/pify?keyword=npm+copy+files. The document body is heavily obfuscated but contains references to the malicious URL. The presence of many external PDF links suggests a link farm for SEO poisoning or traffic redirection.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=npm+copy+files
    • http://files.musicalfuturesdlownloads.org/uploads/1/3/2/6/132681556/wuvezisu.pdf
    • http://files.lifestylemagazineflorida.com/uploads/1/3/2/6/132681392/2996106.pdf
    • http://files.capozzoliguitarcompany.com/uploads/1/3/0/9/130969663/mikawasebomutuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/9268393611.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5040/files/61917464465.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/pulanifusedowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taselalodomojobuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/1796140939.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/xogowofudabo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/zobewelizotawenilud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/tekafufolupagonakomomuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/94984001394.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/misobaxilagugixikobusorus.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/riguxobobimaxos.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/18395072478.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/tuvagajakarejot.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_off00007fd5.bin
01ba65d02f5b0ede6e56d252fd28bf4785627cff0c62b4f1fa6fe0319759406a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD5 4924 bytes
font_01_sfnt_off000090a9.bin
bdc32cf345a1343056dc79176acebf10fcb4d8737013d6ea2e10e3f692b8c366
pdf-font-stream PDF embedded font (sfnt) at offset 0x90A9 13620 bytes