Malicious PDF — malware analysis report

Static analysis result for SHA-256 250962b224307afb…

MALICIOUS

PDF

58.5 KB Created: 2020-08-12 15:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2c8440ccc13f0164b837d9a0a3ce9a SHA-1: 1e7efb780f17406e01c3e3889b18c06015d55087 SHA-256: 250962b224307afb4e3b494dd30432b6b0ac1b683a571e352a510c3786cbdc69
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a search result for "Ms excel test questions and answers pdf". The PDF also hosts a large number of external links, many of which point to Shopify domains, suggesting a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ms+excel+test+questions+and+answers+pdf
    • http://files.ballyadamsns.com/uploads/1/3/0/7/130775013/zosim-gifegoroxiniwo.pdf
    • http://files.cocreativ.net/uploads/1/3/2/6/132696249/rujibemepodinig-fifokuvo.pdf
    • http://files.sugarplumonline.co.uk/uploads/1/3/1/6/131637020/tesikoxogosu_giwedo_pababefo_bigibakola.pdf
    • http://files.welcomeneighborpa.com/uploads/1/3/1/3/131380754/fitagufisilik_wugamilotogoku_rozulikizo_dapiz.pdf
    • http://files.thesimplestbizforu.com/uploads/1/3/0/7/130776503/a93407b1b.pdf
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/rawazazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/69824608304.pdf
    • https://cdn.shopify.com/s/files/1/0447/8612/2901/files/all_amendments_in_constitution_of_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0447/6780/5591/files/saxasomirojabonivavezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/sixitokofiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/histogram_plot_python.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/administrative_coordinator_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/86120549627.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5153/files/il_1040_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/ludoribojananepuwowipol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008af2.bin
8eff702d0a5f60b66381a326f79e3d560ab0c7b978d12fc37d28ed79c5b67f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF2 5324 bytes
font_01_sfnt_off00009d2d.bin
4c1b7c471e02c920db2d8b1fa45f2e6b6c026aa189e2302a914306ae4a878ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2D 2560 bytes
font_02_sfnt_off0000a846.bin
d783c441c392f7ea544baa6af60ba120ea9668538efd679e1ead93e4d12a73c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA846 11108 bytes
font_03_sfnt_off0000ce00.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 4324 bytes

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