Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9a0cb9a407e3a1…

MALICIOUS

PDF

47.7 KB Created: 2020-10-31 04:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1fb5032cb28583479f7ec1f5d8c4c873 SHA-1: 162d3e64030da2a3eb421aa436f6a4a4b36dcb98 SHA-256: 8d9a0cb9a407e3a181eab6058fe606b3cdd20d5e96cd710414c2634cbab84ecc
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous links, including one pointing to known malicious redirector infrastructure. The presence of a visual download button lure suggests an attempt to trick the user into navigating to a malicious URL. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

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://cctraff.ru/aws?keyword=codelab+answers+c%252B%252B In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f875e72ce3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f9741603200d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f8a222877f7f.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/welevedagarik-pawevot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8e81eda5b1f.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/jefasujiziwujoxex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5f95e49036fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5f91f1ca75b73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5f9722b292617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f875df05a6d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f8f78323fd68.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/f3dbf6da-9cc1-4294-9395-77e25e9ac2e0/decision_brief_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec15212-e901-4455-a382-c4b0bf97e244/silafafupazoxigulajovud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f2d19e-2f70-4188-9e02-6fb7a77263a9/zawuzibebozen.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/10324767389.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6299 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off00006cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 4848 bytes
SHA-256: dc0ea175933e6563be75dd21926081a0348874ee11e75caac51f14920e622c86
font_02_sfnt_off00007d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D68 11180 bytes
SHA-256: d3f2770c87341b3a48adb132a646896f12881baec6fdaea6d28d449f1aa6c6c4
font_03_sfnt_off0000a3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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