Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b9d12e4b551b95…

MALICIOUS

PDF

34.5 KB Created: 2020-10-15 13:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e7a38e70474808f5e8c94e64920bfdec SHA-1: d27a8d3f53067bc3d15b47fc5a600a1fca02169a SHA-256: e5b9d12e4b551b95b4d2d782d3a5cddfa84b38e0f1b28c348fae3ac45c02744e
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as educational materials but redirect to a known malicious domain. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for SEO-based link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=prefixes+and+suffixes+worksheets+pdf+grade+6 In PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/4262709.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/bisofonitakopos-gudawubimoliw-tajabafox-wotifene.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/regamafizesoxidiwed.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/varete.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/5734794.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/69c6fb656594.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/2122744.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/ropesigele-burevake-likid-renolidisawem.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/ruluvojasexanudup.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/1131068.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/8543923.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/lesuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6728/8989/files/angelcare_baby_monitor_ac420_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8177/0155/files/pegiriwepisisater.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3088/6053/files/nudevilevagufis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2062/6331/files/auto_expressions_sunshade_size_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0996/4735/files/matrix_algebra_for_engineers_gere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534acea7-efa8-4f08-b26f-ef50b31aefc6/barubabalawopevar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beedbe65-e8be-4a69-9085-af5f1305513a/wunevoverejuroj.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5A 5652 bytes
SHA-256: 31d171e0b6d19952bcece2b9dd259f448d10400f022d2a179cca53b598299449

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