Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f71dbea94a0a7a3…

MALICIOUS

PDF

45.4 KB Created: 2020-09-30 20:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a924a5b897563bf88d1b43804ea3bc0e SHA-1: e30c340df5da45b651cbb48808106fed225fdb4c SHA-256: 5f71dbea94a0a7a34d969e631bdc1f2006dffefd3f3a3dfef31e970ab6349b8e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, embedding numerous URLs that lead to potentially malicious redirector infrastructure. The document body, while heavily obfuscated, contains references to 'cedar strip canoe plans pdf' and includes a direct link to 'ggtraff.ru', a known malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm designed to redirect users to harmful sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=cedar+strip+canoe+plans+pdf In PDF document text
    • http://kirar.spotlight-video.net/uploads/1/3/0/7/130739615/6052199.pdfIn PDF document text
    • https://site-1038951.mozfiles.com/files/1038951/9867063784.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/93265623815.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/9279681550.pdfIn PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/lovefosumarapofafalak.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/fexitisata.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/ff2c6a55-569e-40f9-9282-a1a1e2045581/kuzokozenupupuwen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b30e6e-dd5b-415c-9670-7f7973a8c068/mekovuzasowabawim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91cade69-b328-4e21-b393-3d572a333d08/tuvaxakitobapifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82383078-1b50-4f8e-a58f-745f7ab85a81/57671995399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/calendario_escolar_miami_dade_2018_a_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/cisco_switch_2960_manual.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_off00006770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6770 4960 bytes
SHA-256: 7065d0d84051dbf20826f69ce9cdcde480eaced87cf5e285d489e9f160e5b70f
font_01_sfnt_off00007859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 10080 bytes
SHA-256: 313569cf438d5c4650269e40e6b36750d99bf5f8a60e9fe4c6a7c1c4158fb52e
font_02_sfnt_off00009aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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