Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1548700ccbb07d…

MALICIOUS

PDF

36.2 KB Created: 2020-10-28 16:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08a60d5992e119c98a6c1aa60654e093 SHA-1: ecfa97faa9a887eded036b6b6b5c7d64cf8695f3 SHA-256: cd1548700ccbb07dfa6c17aa3fe0675319bb9f3542e0c89860a13cbd0127a095
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised with a seemingly innocuous keyword. The heuristic PDF_SEO_LINK_FARM indicates the PDF is part of a link farm, likely to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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://ttraff.club/123?keyword=volleyball+knee+pads+academy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f92568a9f495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f8eb7b678aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f923aa329d09.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/1/0500/4502/6454/files/telecharger_youtube_mp3_sur_android_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9166/6106/files/vakotuwodizekorapabix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6839/7974/files/82060579230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8fb590-ef0c-4bc7-80ba-b07f002e3b5e/36914633837.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/52466759151.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/93358490667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c89d1c3-e45f-4f32-b60a-98007a4da0c4/ratilopadegajarojox.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/duniraropisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4675b955-b84b-421c-af9b-ea2d09ab1206/weladixisiwijugupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2403/0618/files/88458609313.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/20142419790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7513/4135/files/download_apk_vidmate_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/walapaviwubixiduvum.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/66496290833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9230/1718/files/cole_sanders_bernie_age.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/71369911175.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/99254807380.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/43078603967.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/ashrae_standard_90._1_si.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2759/3879/files/difalutipumadam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b809205f-32ec-4ea5-8fbd-5f13ba180a64/38195819715.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5097 5396 bytes
SHA-256: 08732215f390c18505e86a701327e668b9017e64db6e90c018436611b0bb57ff
font_01_sfnt_off000062eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 9892 bytes
SHA-256: 09913a7fe6dcae486add2ef12b035ba9935bd38585b9a7bb0ad9f15f135eee02

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