Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd01e307f69dfc…

MALICIOUS

PDF

41.9 KB Created: 2020-10-25 22:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e43f6ed3707b355bd6b7a74880c6c7c9 SHA-1: 74d1b2a1a9f64542ad257cf9c1afc199b2ffc24c SHA-256: 3acd01e307f69dfc4e8138b0b24384ac34ea8e72ab10be4b74df43b35471e225
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/123?keyword=mulk+raj+anand+two+lady+rams+pdf, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/123?keyword=mulk+raj+anand+two+lady+rams+pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/5484608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tofizo/green_lantern_comics_download.pdf
    • https://s3.amazonaws.com/donake/8493752002.pdf
    • https://s3.amazonaws.com/bulozor/aditya_birla_mutual_fund_sip_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/gatorade_whey_protein_powder_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/short_summary_of_animal_farm.pdf
    • https://cdn.shopify.com/s/files/1/0268/8263/8023/files/probability_and_statistics_degroot.pdf
    • https://uploads.strikinglycdn.com/files/2820d599-35cd-456c-82d7-0cc9000faaa4/engineering_electromagnetics_hayt_8t.pdf
    • https://uploads.strikinglycdn.com/files/ec47a6c1-b936-4f86-b3b3-89cfdce1fb3f/32620141896.pdf
    • https://s3.amazonaws.com/sugaguxagu/sukizut.pdf
    • https://s3.amazonaws.com/gupuso/zumapopusi.pdf
    • https://s3.amazonaws.com/joterige/computer_programming_books_free_download.pdf
    • https://s3.amazonaws.com/jepinebawo/anexo_14_oaci.pdf
    • https://s3.amazonaws.com/vezumobigodub/samsung_company_profile_2018.pdf
    • https://s3.amazonaws.com/fasanag/que_es_diagnostico_organizacional.pdf
    • https://s3.amazonaws.com/pexodugosa/importance_of_teaching_critical_thinking_skills_in_the_classroom.pdf
    • https://s3.amazonaws.com/petikamov/teaching_bursary_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bb.bin
795fb91edc7395d2a8be2be63c72f93a830f668590119acfe56c68a4a25b5f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5528 bytes
font_01_sfnt_off00007799.bin
9b34f5cf354123c72c2939c3851dfc4a90717e90ace9241653aebf4722ebf422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7799 10356 bytes

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