Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c99db391806673…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 18:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbebb8920c27081b642ad42d428202bd SHA-1: 3bd6ea9834286265f0fd4eaaa7a0a626c42d763a SHA-256: 50c99db391806673bc10daff185ff9a33258d356d630e1d7f7c8648cdd760ca1
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify-hosted PDFs, suggesting a lure to a malicious site. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure.

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.ru/pify?keyword=business+english+course+description+pdf
    • http://files.thespacebeechworth.com.au/uploads/1/3/1/4/131438483/7fef8facd07e37.pdf
    • http://files.gmroofcleaning.co.uk/uploads/1/3/0/7/130739489/rarijalatunividorut.pdf
    • http://files.connectingcommunities.com.au/uploads/1/3/0/8/130814245/be674e451f228b.pdf
    • http://files.progressivechiefs.org/uploads/1/3/1/4/131437318/deraxegapiwa_sewin_radow_xusikijodefomo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/zijitavaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/3312614922.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/minecraft_java_se_binary_not_responding.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/gungeon_flare_gun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7682/files/tazumutafubit.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/fixoxufeniwamemaror.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/aura_carlos_fuentes_english.pdf
    • https://cdn.shopify.com/s/files/1/0436/0113/3731/files/40107953113.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/pokodopunomina.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/dedixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/wowegixagojoberurulowetij.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7679/files/78894818528.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_off00005fb1.bin
d317ddbc2bb8382b731e89a46825b2a976e7d59e491e073079a4383bd450c128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB1 5256 bytes
font_01_sfnt_off00007194.bin
7b261dc644d3674ab27f4467c910ee53693379293860ba3a4cffa1abafd405de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7194 10376 bytes

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