Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2a85328987fefa…

MALICIOUS

PDF

48.4 KB Created: 2020-09-30 20:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70f0d051ba075a0f03d328b9331a99c2 SHA-1: dcdf0b2f354943e77cff94f413c0448d1e45dafb SHA-256: 0b2a85328987fefa7f530d8ed97da4cda451c5775620a0783baceea5e5582ac7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains embedded links, one of which, 'https://gettraff.ru/strik?keyword=anorectal+malformation+journal+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic to disguise the malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/strik?keyword=anorectal+malformation+journal+pdf In PDF document text
    • http://files.justinbendell.com/uploads/1/3/0/7/130775730/ece9c396f567.pdfIn PDF document text
    • http://befuja.catholic-teaching-alliance.org/uploads/1/3/2/3/132303189/disebabas.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/1/0436/3842/3710/files/new_flight_simulator_2017_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5472/5270/files/57983611607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/66112058805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fc6d18-164c-4e01-bb87-fda5bcd4ab8f/45176393223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acba668b-0030-44c6-b056-6d6938f378c3/xasefov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ac9be8-2721-4872-b333-6503e8d1d945/88621488208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779e5dee-9880-41a5-bf9b-5a0a2a9869c0/xajopixepexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710e9477-ce80-44df-bebd-8456fbbfab27/fotujibiwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fff02c-37aa-418d-b419-059684cc889e/japebibotapixiwonan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d018e861-3ec3-45a7-b84c-057b0ab2cfff/rufasoxudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8d5046-f573-4244-9cad-f8102729ee01/83748287950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd647c16-4682-4c8f-8425-7bbd63e933fe/26140723940.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_off00007fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE2 5188 bytes
SHA-256: 6784d1d8efc3696e08bee48101527c1ece4434634e8193097681886bc3157225
font_01_sfnt_off0000917a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917A 10672 bytes
SHA-256: 0d395bd224d1107299a030feb813c59ce984c2200192ad2015675e0d7b185384

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