Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c426947af821df7…

MALICIOUS

PDF

45.5 KB Created: 2020-11-01 19:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3a819681c9da72728cecfe95f36c3de8 SHA-1: 2f4ff0f866af70dd0ee6c73ba084b751f40e5246 SHA-256: 3c426947af821df7354319613aff959f053ac30de8d7ec81e5449673807915fb
134 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link, identified by multiple heuristics, that points to 'https://cctraff.ru/123?keyword=apk+showbox+android'. This link is presented as a lure for downloading an Android application, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=apk+showbox+android In PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/divesovomoweme.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/fejewemotobejugeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/560058855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5647/8370/files/turbo_machines_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89adc83-57f1-466b-b92d-5689723bda94/72058768348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2406/4410/files/intermediate_directions_social_studies_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9171ee-1f69-40c7-adaa-f893b74fd1dc/warframe_pistol_mods_fire_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/nesugosori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1889/7573/files/types_of_transport_mechanism_across_cell_membrane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5437/2259/files/5974755694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d3cfa7-6a9e-473b-b72e-99e649d6008f/graco_literider_lx_extra_base.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7217/4233/files/58828611916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdf43d5-13c1-479b-a7cb-6ddcb39a3591/zimam.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_off000072bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 5368 bytes
SHA-256: cb37cf42ad7ccfd6e72a26982228a57345d37335214d1c3bbc5d20e047d8b3ed
font_01_sfnt_off0000850c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850C 10668 bytes
SHA-256: d6bdc2f3d26989de7684144016b62321c81f66ea1c03aaf754302c54227da3d6