Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa24e30c3b84cc4f…

MALICIOUS

PDF

34.4 KB Created: 2020-09-30 19:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7fc293a09782cd44103409c97f4a755a SHA-1: 5290be4bbfba96f4fdba211593674164c97a5d66 SHA-256: aa24e30c3b84cc4fe88822cbd4688b64bc81370333e1f3e42394f5942b1df270
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs, one of which, https://gettraff.ru/strik?keyword=reckless+love+bethel+chords+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, many pointing to benign Shopify domains, indicates a potential SEO link farm strategy to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/strik?keyword=reckless+love+bethel+chords+pdf In PDF document text
    • http://palumo.menashastrong.com/uploads/1/3/2/7/132741031/bewekimomo-butofivagij-sabexe-zodalad.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/1/0434/1897/6408/files/26097667758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/30165878945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6411/4852/files/chemistry_raymond_chang_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ea8c84-76c8-467b-9498-1b29e8eae802/wulupifapesebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6004f8a2-d083-4520-9403-de003d0d6971/50042903277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8443/7922/files/ghibli_cello_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/jenafagaf.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_off00004a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2A 5304 bytes
SHA-256: 29cee3510c5c605b7b5768515980586ab27731baf242b4d41892b32e40c23608
font_01_sfnt_off00005c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C39 9704 bytes
SHA-256: 4c2997b50012ce2174c1ff7e6420dde77b4f21309d6fd80a51f09381e0b5145a