Malicious PDF — malware analysis report

Static analysis result for SHA-256 38500aeb2163516a…

MALICIOUS

PDF

75.7 KB Created: 2020-09-30 11:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 184603a2fca4e972a808188a21184818 SHA-1: 79a19f681336cb41c8b2146333922c2d5ebe996b SHA-256: 38500aeb2163516ae875cb694a8e3439feb7919e4e81e94fd0d0bf21c781a03b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://gettraff.ru/strik?keyword=curriculum+development+system+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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://gettraff.ru/strik?keyword=curriculum+development+system+pdf In PDF document text
    • http://files.bellabirth.org/uploads/1/3/0/7/130740175/tovopuzeved-wevusib-silur-lasijupoputaf.pdfIn PDF document text
    • http://files.pendapat-malaysia.org/uploads/1/3/1/8/131856827/1294950.pdfIn PDF document text
    • http://files.guyinspired.com/uploads/1/3/2/8/132814303/zaras-mobalafadepij-raguwalef-dojagipamoriw.pdfIn PDF document text
    • http://files.nicolloabe.com/uploads/1/3/1/8/131857049/wumogo_pevakut_lujalir.pdfIn PDF document text
    • http://fuzadit.philstile.com/uploads/1/3/1/3/131379510/f47e21657aa13ca.pdfIn PDF document text
    • http://bupume.pacmuners.com/uploads/1/3/1/4/131453465/korenotijeta_kuvojiximez_tijeposinaguf.pdfIn PDF document text
    • http://nenivo.tanyablackwell.net/uploads/1/3/1/1/131164250/9191312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4508/1247/files/generador_de_bibliografia_apa_en_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1324/6623/files/aidh_al_qarni_la_tahzan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/43920302454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/30519133329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/doxasixuloranejakum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7804/8162/files/wawegukipofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/wugoxulikowametupaxada.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5156 bytes
SHA-256: 4f31dea41830cb553591724ea98e59ef60dace7d93adaf682a42b05932c15ab7
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10076 bytes
SHA-256: 6b4067c3667806db2036e88cf5eb19ec26bbb841925f53bc7875e173a6ef15ae
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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