Malicious PDF — malware analysis report

Static analysis result for SHA-256 23969043a503aaab…

MALICIOUS

PDF

44.9 KB Created: 2020-11-01 21:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4cd52a525bb95f95468277d220a30a0d SHA-1: 90ef97e25ba13cf6f5f5fb1db81143b6290b1a9d SHA-256: 23969043a503aaab804f457c881db3d48732c03995d1770babcbed13839efbb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or SEO link farms. The primary malicious link identified is https://cctraff.ru/aws?keyword=budget+worksheet+for+college+students+pdf, which is known to lead to malicious content. The document body itself is heavily obfuscated and appears to be a lure for search engines, further supporting the SEO poisoning attack pattern.

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=budget+worksheet+for+college+students+pdf In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/sevufujarix.pdfIn PDF document text
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/9973180.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/pazowagud.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/nekego-susodixamanejik-jedizem-vuwubamidateje.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/f0018a26-7033-4bb5-8d31-a0af4c45f88f/61823230056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7ecc01-7821-4674-b689-5ba82b19b48f/45708818801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2118/6718/files/kuta_software_graphing_lines_7xy5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0787/7017/files/ms_hernandez_weebly.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7656/0059/files/32045583109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b38ac0-6700-4df5-a010-b2a3f1553a1d/p90x_3_agility_x.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_off00006249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6249 5244 bytes
SHA-256: 50d653ce684abab1d3d8bbaabaadea9c43358efcf82f6573c0c6b109baa8b545
font_01_sfnt_off00007434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 10444 bytes
SHA-256: 9ddd524a02f1e153e7c64e5bd7ff95b36b74d752f8612c499a87caeceefff778
font_02_sfnt_off000097fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97FB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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