Malicious PDF — malware analysis report

Static analysis result for SHA-256 185142ed2908afe0…

MALICIOUS

PDF

97.8 KB Created: 2020-10-30 00:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c81f5bf3f51d5d228cf7f204ecc0122f SHA-1: d8b27af2d243a1d0961701a5a85dd52608bf6b62 SHA-256: 185142ed2908afe0a37d70fba5946fc481ba67cda995e4ee81a73fc40bce94cb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=thinking+with+mathematical+models+investigation+3+additional+practice+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_5f901bfd6597d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f998ecf706b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f8c113a353eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f89e5b392031.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://s3.amazonaws.com/mizeteb/pykl3_radar_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/1798/5958/files/miltons_cauliflower_pizza_costco_cooking_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/cauchy_schwarz_inequality_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/oxford_dictionary_english_to_bangla_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64863b1-e884-49a5-ae35-146814e22ee3/sutozip.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/67914088732.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/mafefuvuveserebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd9b1aa-f6d2-4488-b9e8-c613ba4144c6/ragini_mms_full_movie_download_480p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/mindfulness_meditation_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/zuliguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff5b6a7-c786-42cd-a18c-db7f54c41634/benatasibovotikabar.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_off00013456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 5604 bytes
SHA-256: bb4094fef7ce70326a978fd8cbb26e048ca6fbfe8f435d473fbcbe17035ac5ff
font_01_sfnt_off0001473b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 10336 bytes
SHA-256: 2d1a7c9faa58dac29dfd22b0a813589b38c879c0043fdca0180781a7884e8909
font_02_sfnt_off00016a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A71 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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