Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f92153c4e42b9a5…

MALICIOUS

PDF

46.7 KB Created: 2020-08-10 02:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004c3defde484a9e2439400b709ba62c SHA-1: ec1dfb6d2b6f19a238a450682d5a9ddba2179307 SHA-256: 8f92153c4e42b9a5ec39f61286bf0b50e7b57a160a7597ca39027c71f4ca2765
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 prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. This suggests the primary goal is to redirect the user to malicious infrastructure. The presence of embedded URLs and the ML classifier strongly indicate malicious intent.

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=artificial+intelligence+in+banking+pdf
    • http://files.chilihead.net/uploads/1/3/1/3/131398497/0fc7bf.pdf
    • http://files.leggsmanufacturing.com/uploads/1/3/2/6/132681783/f2612908b557f3.pdf
    • http://sagako.calvarybaptistemporia.org/uploads/1/3/0/7/130775085/mozidebabe.pdf
    • http://files.upstartglobalenterprises.com/uploads/1/3/1/0/131070178/181760bc.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/roxevarunifewali.pdf
    • https://cdn.shopify.com/s/files/1/0433/3528/6943/files/75436444814.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/jopoberolobiputugi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/88897425697.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/65488936566.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/forage_carottage.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/81582478106.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/vudisojujadogubif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botezosural.pdf
    • https://cdn.shopify.com/s/files/1/0438/2041/7181/files/zeronet_jessica_nigri.pdf
    • https://cdn.shopify.com/s/files/1/0430/7854/9665/files/historia_clinica_fisioterapia_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/35299493776.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/
    • https://cdn.shopify.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077f3.bin
bf74f0510695231e8e7d11535371ab327acab7914f1f3f4ae10e248e1975acfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 5340 bytes
font_01_sfnt_off00008a29.bin
bc60dc2586824a1261599f17d300f095320e2fa6582192c59556d176994d06b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A29 10272 bytes

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