Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e2efcec873c907…

MALICIOUS

PDF

40.5 KB Created: 2020-10-25 22:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fcf3a7f766399031401016818380fca4 SHA-1: 3b5ba3d60caa2affa113d4e44a5965c7e07f25ca SHA-256: 97e2efcec873c9076228f2699efdb0474e10c66aeef40f358fd4a880c54c6d55
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and redirectors, including a critical finding of a malicious redirector. The document body, though partially corrupted, contains a URL that is also flagged as malicious. This suggests the PDF is designed to direct users to malicious infrastructure, likely for further exploitation or phishing.

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/123?keyword=weather+worksheets+for+kindergarten In PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/719650c.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/0555140d9.pdfIn PDF document text
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/b0c5d0b6a09e8e.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/1327471.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/zawafek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a083b0-8252-45bd-9f14-26c25543c9df/alan_paton_cry_the_beloved_country_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a893d34-54bd-4d18-99a1-ff3c2ab34da5/99122389352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47cd01b1-65b9-423c-8d2b-8ffec41a1b45/5961503700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebe844d-e35a-4996-90e6-4a9c386ec843/gebex.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/common_core_standards_math_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/arbitration_act_botswana.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/64012876325.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/a_positive_blood_type_diet_to_lose_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/toefl_exam_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/historia_balistica_forense.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/barbie_doll_sewing_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/apprenticed_to_a_himalayan_master_a_yogi_s_autobiography_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/core_muscles_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/925887770.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/wesawamudip.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/66632955234.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_off00005e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E63 5304 bytes
SHA-256: 23657fa205ef9d82e3bbff5d96eb680a2054d49ce945ffb0b60a57d5aa84dd6b
font_01_sfnt_off00007086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 10548 bytes
SHA-256: 23ce63e07a139db313f1b78cb36132319ae774d0a8487ba3dbbd7dd3e2b9f215

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