Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f0edbefe5208e5…

MALICIOUS

PDF

44.5 KB Created: 2020-10-02 03:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bfea6111a5767560ac09e9750bdb3f26 SHA-1: 948f23b92f101e376a8a20bf03e3fce524080366 SHA-256: 77f0edbefe5208e531284217a75679d1157806921d720e797efb8ffaf862d3f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to '6th grade math trivia questions and answers' and the malicious URL, suggesting a lure to a malicious site. 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/strik?keyword=6th+grade+math+trivia+questions+and+answers In PDF document text
    • http://files.oldestbarineverystate.com/uploads/1/3/1/6/131636814/7062772.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://uploads.strikinglycdn.com/files/8afbf1ea-ddde-44df-acf1-3dde4f8bc57c/vamamudatalawekivulowij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce55c06-ffe3-431e-876a-619abf8c93f8/natosapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6d80ed-62f2-4e16-917a-41f89f0de2a3/digeferus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0787094f-7375-40b7-a0c9-c77d5907a197/51052392006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72a8bb9-ddb0-4ca6-b22a-18366316b3f3/xojopofojozafemiketete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/bonavawex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/icnd1_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/starbucks_flexible_work_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2927/0175/files/star_wars_google_docs_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3696/5029/files/aeneid_book_1_latin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8785/9354/files/windows_10_apk_for_android.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_off00006098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 5424 bytes
SHA-256: ca22a089815872812642951ab5d5d10a4f8e2dc75b46c697ac4a9beb029a184a
font_01_sfnt_off000072ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 10580 bytes
SHA-256: 1b1eb7e9641f488d4c265bd24782277d0e258c3a078bc92c03d57b897d9dbaf1
font_02_sfnt_off00009723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9723 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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