Malicious PDF — malware analysis report

Static analysis result for SHA-256 f478a5f451410c8f…

MALICIOUS

PDF

53.8 KB Created: 2020-10-29 10:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a2f4032bcbbdde3b26803ab78c24cda6 SHA-1: ac259e91555e9820417849c63d5738fb1dad901b SHA-256: f478a5f451410c8fb88b0aaed3013df5d92b055456e5b555be26feacdd85009c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/pify?keyword=7+habits+for+kids-+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f9085d921c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f96fc563c0a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f912322c9e67.pdfIn PDF document text
    • https://lewelekokoje.weebly.com/uploads/1/3/4/3/134333059/8944377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5f93785352156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5f97c9d4cf31c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f9381d3cf04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_5f979776e74b5.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/57d02b5e848c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8e738e58d13.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/b57e55c7-b11a-4939-a575-1fcc8d3beffd/rujituguduxulepun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1987/8567/files/joker_full_movie_free_online_netflix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0862/9185/files/rulexolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c941279f-9afe-491d-888f-c46f2eeb4e0e/injertos_de_arboles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac9a5eb-d7c8-4a9b-bc7a-dfcf40b8a9d5/71063949612.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3075/9582/files/ketizevuwape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45fe6c9-0a9d-4974-97f2-226e374a745e/99570064567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2045/4554/files/takarum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7244/7153/files/gasglo_central_heater_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/parrot_voice_recorder_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6245/5191/files/prentice_hall_geometry_chapter_1_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0dbf0c-48c2-4a7a-9ee3-266e582345d9/65705293467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8588/2044/files/the_pretty_reckless_going_to_hell_album.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9471 5276 bytes
SHA-256: 3d54a482c81e7e49e5fc9fe1acf3416441edcd8c3b96db17b2c6ee8b73383c87
font_01_sfnt_off0000a673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA673 10232 bytes
SHA-256: 341dc3e77508ee26bb0682a75dec360e5d387230d2cbade1b1574ca3de5e40bd

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