Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24ce7c0916ff0e9…

MALICIOUS

PDF

51.0 KB Created: 2020-10-31 21:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 20f0ff6625f69a05b162925e0b1a01f7 SHA-1: 981529d888e7f4c4e3c5a074014b0042fd4318f1 SHA-256: e24ce7c0916ff0e9774223136807d0ff46019dfa4bf4a3210635ffb741134b9a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=investigating+el+nino+worksheet+answer+sheet', which is also flagged as malicious. This suggests the document is designed to redirect users to harmful sites, likely as part of a phishing or malware distribution scheme.

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.cc/pify?keyword=investigating+el+nino+worksheet+answer+sheet In 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/4aba1529-c262-41bb-a195-4b6792faa828/36141501941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04f7604-b30e-49b1-81da-24cdfdc211ad/87293005673.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/causes_of_neolithic_revolution.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/alimentacion_parenteral_en_neonatos.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/spectrophotometer_principle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7578/9488/files/2897575102.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/xajetagisolatigomizedeke.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/comment_assembler_2_en_1_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/18878526218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df21e1be-4c76-4f01-afde-8c139ad9cb80/vozonipaleram.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/5850069187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e91bbb-d5dc-4e7a-b491-0ac6af7c8801/63029243756.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/majimoku.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_off00007cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD9 4888 bytes
SHA-256: cc39e275c1a7ea19eae5278bad69b1c86daa15546945f91b130addc6951dc7c4
font_01_sfnt_off00008d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D76 10288 bytes
SHA-256: e022904ca81e6a4c22a1cee4122a6dad07ef672b6136c2a04806c86b7f8f0582
font_02_sfnt_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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