Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3629dfc24978fb…

MALICIOUS

PDF

56.0 KB Created: 2020-10-26 12:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cb1a93d7f79ef5c00ccf045931d2109e SHA-1: 32fb1d2e1bc9bcaadcdfcd6293f8452142d9b633 SHA-256: bb3629dfc24978fbf829ea237b4d577284db92a17d1875d75018425a6b402f95
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign-looking documents, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to disguise malicious intent. 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/aws?keyword=chick+embryo+development+pdf In PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/9898247.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/5e858dd23fda5.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/wobulos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jinabom/chopin_ballade_in_g_minor_op_23_no_1.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/detailed_lesson_plan_in_english_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/98561378984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6913f684-1ddc-4465-a099-d388dc7daf4b/tafuxebukarowodorotuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c887421-5066-4e23-86ee-d930a6e09958/duxojirofizorojevovuwupev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74f0ea5-9e77-4400-b4f9-b42e74edfecd/jabunivunegesuvedelitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1f8c4b-c185-4a5b-a576-b3c54fb0668d/aaja_sanam_madhur_chandni_mein_hum_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dd4f72-2557-47ad-b9e6-e23d3fedf58a/libros_de_dibujo_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca43e8b-c98a-4751-9c41-482985f08f9a/sexumuvodolom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2aa1405-b72f-4676-879d-e7a652b4477c/duxelojexupuditizerowaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8527/6357/files/molujukomimimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9333/7281/files/29114440459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3221/1367/files/mamodoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2951/0324/files/dogaxetipobowekorejiteju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4963/7792/files/strong_acid_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2022/9014/files/sacre_bleu_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7838/3282/files/facebook_login_error_on_android_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7D 5184 bytes
SHA-256: d1ec9eb9596c37d37e30f9c6364f449d35e83056f0f081548d0086255af3bad4
font_01_sfnt_off00009efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFC 11632 bytes
SHA-256: f916f1b53cc835ac82eefffa3f46be72e6c43118b5d76bc1cd8207a320383c47
font_02_sfnt_off0000c4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.