Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28416406cffd8b7…

MALICIOUS

PDF

69.1 KB Created: 2020-10-15 03:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4c1e8a5c972ae97b4c81e34306311f98 SHA-1: 32306f6d3d8476649af54f9cdd78ee544c4157d6 SHA-256: b28416406cffd8b717b53767776e9f049168c2c43582f21a1b5ae1f2569307f1
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=labour+law+for+managers+practical+handbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f877988c5b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8700105f617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f878b71bd9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8730a2abaf2.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/wodabaxazugiwafab.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/wurogopijeza.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8e42bfb8d1b0f.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/sojivegugel.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/4160188.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.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/1/0486/1463/7726/files/slander_by_deed_complaint_affidavit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9316/8806/files/destiny_usa_bus_schedule_syracuse_university.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/return_of_the_pharaoh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/senior_software_engineer_resume_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/harrowing_nightmare_pack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6616/9246/files/33110072270.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8896/0416/files/emily_is_away_3_endings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7767/4182/files/wolf_life_cycle_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/gisuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/carl_von_cosel_pelicula.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_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 5808 bytes
SHA-256: 8179d3f7caaf4995f56c80714682754f4b3c8df3b2febfe4183da151b445e28d
font_01_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 13312 bytes
SHA-256: 5babf6a0bebc2c6c22e3d0d7d81ad194b26f453ec712efd1c0da657f6546ec34