Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62f08aaaf869080…

MALICIOUS

PDF

45.0 KB Created: 2020-10-03 00:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d27366cdc2b67599136a6afe54bc2a1f SHA-1: ded7960e0709e7d60034af012895aefba7cd9239 SHA-256: d62f08aaaf869080f1eae12db64cd34192335bfbffe489d4042d4009f6461200
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external resources, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential pathway to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=framed+ink+pdf+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC In PDF document text
    • http://files.cyberzone.ca/uploads/1/3/1/6/131636983/niwosigilutukuvupazu.pdfIn PDF document text
    • http://files.fancy-dancer.com/uploads/1/3/2/7/132712011/buxuramok_pikuteredebaw_muwaso_fefuke.pdfIn PDF document text
    • http://bujugodi.thebird-dogs.com/uploads/1/3/1/8/131856235/rejonudigaxokijurab.pdfIn PDF document text
    • http://files.kellettcommunications.com/uploads/1/3/1/3/131378899/e0ce7dd29.pdfIn PDF document text
    • http://muvot.duffeyphotography.com/uploads/1/3/0/8/130874493/xanupowe-piwufipa-lujiwi.pdfIn PDF document text
    • https://site-1038553.mozfiles.com/files/1038553/32212356990.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/jixesuduvazomavi.pdfIn PDF document text
    • https://site-1042734.mozfiles.com/files/1042734/21504803120.pdfIn PDF document text
    • https://site-1038339.mozfiles.com/files/1038339/jitelome.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/1/0437/6631/7205/files/hamlet_act_3_scene_3_study_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/43788568132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/25436677524.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/rbi_baseball_16_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/buxudugimejumosi.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_off00006263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 5896 bytes
SHA-256: 7926d81f5a45902bb382af668196bccac8b04f1c2f6fb159000ba1b32e01c0f1
font_01_sfnt_off0000752c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 15368 bytes
SHA-256: 04095d57c6a6156a14dfdbec0cee2c31c8d72193bd10d541cdb72f992315b3de

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