Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ffa3fe574383c4…

MALICIOUS

PDF

53.0 KB Created: 2020-11-09 12:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 926b700164315f5164f2213fcee75eb0 SHA-1: 2f0a5c13687e644b8eba03c97c5797c55dbd8035 SHA-256: a3ffa3fe574383c47fd579bfa3f514f6c09604aec0b98f2bd44c5da533cb6b96
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector, 'traffmen.ru', which is further supported by the ML classifier's high confidence score. The document body contains a call-to-action phrase, reinforcing the lure to click the malicious link.

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://traffmen.ru/123?keyword=how+to+install+apk+on+kindle+fire In PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/3384896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5f984014c43e6.pdfIn PDF document text
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/zofutixipimigi.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/75aa99b09.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/kowuzafisitazolux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fa0aebd38c52.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/3936137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8bfd8136112.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://uploads.strikinglycdn.com/files/30490283-74de-4a78-acb8-e5563b5e9edf/kegixakakidaje.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/xerubuwelofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41650d94-d704-4703-bd4e-b211cf99c306/1806219881.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/rave_glow_sticks_gif.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/1375340900.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/koxozaparinexoxoxibarile.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/vomisaxokiwurezefetabetez.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_off000082ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AE 4940 bytes
SHA-256: cc30816c9196fe80ce366da7ec776fe5b55407e1aa1cf8ba88e2b348c37715e7
font_01_sfnt_off0000938a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x938A 10940 bytes
SHA-256: c0c80550a391bca12b590d2126178989e741ef7f1c3314cdafca463eb3617d44
font_02_sfnt_off0000b8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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