Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27a752c9eca3b59…

MALICIOUS

PDF

46.3 KB Created: 2020-10-29 02:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b931a6762d2d7cbc655be2f95f98d048 SHA-1: 1cd64d02ed3810937ddfb579492ac3b92dfb2ac0 SHA-256: c27a752c9eca3b59aa65589ef6ed4bbe5cab4e2c5dd5e621c562babd7917e23d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO spam and phishing. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/123?keyword=plaster+leg+cast+stories'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of many benign-looking PDF links in the document structure, alongside the malicious redirector, indicates a deceptive link farm strategy.

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=plaster+leg+cast+stories In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8a6b50a57b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5f92f79c61d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f962fb0b2969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f90debd0ebb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8da0b0b6981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3008/3248/files/tvplayer__android_tv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/weekly_schedule_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/business_strategy_development_application_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/telugu_romantic_novels_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0006/8777/files/final_fantasy_7_walkthrough_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/19061363646.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7935/1968/files/cape_chemistry_unit_2_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0398/8126/files/proven_track_record_of_delivering_results.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/how_to_read_sheet_music_for_bass_guitar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5173/5448/files/63624314400.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/mivetilifusogibonajolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0747/5352/files/62531960348.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xepalarunotalemunav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8560/2215/files/tobutexolevis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0436/1366/files/generac_centurion_5000_watt_generator_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3347/9336/files/33378164397.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_off000074e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E1 4968 bytes
SHA-256: f6e4fac3227dc813e9846ffb230ea73a4b90627c6b22eb9c5b07868402419268
font_01_sfnt_off000085d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 11836 bytes
SHA-256: 3af0d073bf0388bf0a5498637792046ed36cb142ee544ea7b3d418b55527b949

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