Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8165350a44f414…

MALICIOUS

PDF

44.0 KB Created: 2020-10-30 14:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2fce78d65d84fe89c0b852c33b6e77d2 SHA-1: 3160263a75eaf8fbe088a180abf6683607c144ba SHA-256: bf8165350a44f41438052a3f4aa6b984bbf1ede03bd3c5a6798626029997a3ab
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a download button, which is a common lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and the PDF links to known malicious infrastructure. While no scripts were extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect the user to a malicious site, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.com/123?keyword=best+iptv+apk+for+firestick In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f9a1104446c5.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/vukuruwekubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f939ed464b35.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/4994816.pdfIn PDF document text
    • https://zozunane.weebly.com/uploads/1/3/4/3/134316446/pifupemamum_gisiwoburugano_zoxusivilel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/autisme_jurnal.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/62180271633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6424/1561/files/kismat_badalti_dekhi_mai_song_download_wapking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9770/1017/files/budewumapokavilis.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/74932440993.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/broncho_pneumopathie_chronique_obstructive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7350/9793/files/ratamobiluk.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_off00006cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBE 5152 bytes
SHA-256: 2f96d7d751c6716c5d6aa0045a08cfc44fbcfd9f0c7723cd04a11cc2d3531842
font_01_sfnt_off00007e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E69 10916 bytes
SHA-256: 925f19256bbb150036c7d652450de595464b24a2b5371e38f7e4d8f1d54116ff

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