Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc43d47afc298b0d…

MALICIOUS

PDF

44.7 KB Created: 2020-10-28 11:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4fd94bc67276950443af04e0c7b3591f SHA-1: 1fb2fbfeac5a3d9c4622d536ddedbd4aa4d87a4c SHA-256: bc43d47afc298b0db136da0d03d614ff7811b4b72d977e22e8b0fba8bca593a8
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. One URL, https://ggtraff.ru/strik?keyword=savage+life+2+zip, is specifically flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=savage+life+2+zip In PDF document text
    • https://vixepakezo.weebly.com/uploads/1/3/4/4/134447938/dibulego-liwizoleg-kutepumemuwor.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/d4f71ba7f239.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/4670956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f9519c659e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f883dbbdbd97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86f464641b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f885f1c1aec5.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/bepefu.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/5227991.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/nureparor.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/nidukime_xatamiribon_zabaxuna_lekadafososejed.pdfIn PDF document text
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/josodu_xuwigewix_kibiku.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/1/0489/4454/5969/files/smart_tv_samsung_50_pulgadas_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc15fe11-d9c4-4907-8e5c-d0a68d03796b/bretonnia_legendary_lords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3feb2b7-cd13-4fb9-b133-329d3821098c/thousand_splendid_suns_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488a335b-6327-44f0-beb8-bacd567f3908/98231118196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0225b3-a482-4331-a99b-a25db8f4bb9f/63344091895.pdfIn PDF document text
    • http://bit.ly/1NYkiAEIndependentIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 5140 bytes
SHA-256: d5364b456d253c0eddea660760387f68dbd22369a42e7e13f692bd1933212ece
font_01_sfnt_off00007d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8F 12164 bytes
SHA-256: 6e1878331333a022835a6a86a76836270073d58adf848ee157f005fc4e2be952