Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04772bceb030da9…

MALICIOUS

PDF

43.5 KB Created: 2020-10-14 18:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: de00efde5219d82864543958a9501781 SHA-1: 54cb0847ebc6b6edfeaccd42ff128b09530cfde6 SHA-256: a04772bceb030da9035364a76d819207a64537cfa68ba871aa39ed06cba0d043
154 Risk Score

Malware Insights

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

The sample is a PDF that contains numerous links to external websites, many of which are likely part of a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The embedded document body, though heavily obfuscated, contains a URL that appears to be the primary lure. No scripts were extracted, but the presence of multiple PDF links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful sites.

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.club/pify?keyword=bacterial+smear+preparation+pdf In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86f5a643151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f870110a5004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8709b4058e4.pdfIn PDF document text
    • https://site-1038700.mozfiles.com/files/1038700/weseperevig.pdfIn PDF document text
    • https://site-1039578.mozfiles.com/files/1039578/75298176953.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/1/0438/9067/1771/files/lady_falcon_soccer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/28409977539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3301/2635/files/how_to_grow_spirulina_at_home.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8737/3499/files/patellar_grind_test_clarkes_sign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d008b32a-ce05-4820-b3fa-f81043250189/83334597226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecec2786-5758-416b-a743-fad753fa732a/nobujezufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1094783-597f-410e-bb35-cecd839916d0/divoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed294c23-1bfb-40f7-a418-2881bcc98e42/badotoribati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827809e3-3ed1-4d57-8624-1357b713e2ae/62852598737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3175/4902/files/admiral_washer_machine_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4990/0955/files/download_arrow_icon_pack_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3548/3551/files/sasural_simar_ka_serial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/tft_champion_itemization_guide.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_off00006aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA2 5348 bytes
SHA-256: 59bd0086c8c3f6528233b7cba8cf20dc0168ab90417e50a84bea5693c2c8cf62
font_01_sfnt_off00007cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAD 10872 bytes
SHA-256: 7ce838dec486d9ed0e0fe910d208a14231ce0d331862f6458d358075f9600489

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