Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee19f37f08af0e6…

MALICIOUS

PDF

42.8 KB Created: 2020-10-06 16:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2565693c415d7d621e8e5cca20083493 SHA-1: bad16d78cde02e4715b3c33ddab63c718a028bc0 SHA-256: 0ee19f37f08af0e64a14b55e166a4c94d9f52a805c1c26573dcf16fb82b0b206
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to disposable domains and one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm strategy. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links.

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 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://gettraff.ru/strik?keyword=tawbah+pdf+in+tamil In PDF document text
    • http://files.beautifulpinkk.com/uploads/1/3/1/4/131409017/mumetomej.pdfIn PDF document text
    • http://vonare.positivelyfloridatc.com/uploads/1/3/2/7/132712596/litudaman_fexogizoxo_geneja.pdfIn PDF document text
    • http://files.subtiliormusicengraving.com/uploads/1/3/0/7/130776855/serenitonozoj-nosuta.pdfIn PDF document text
    • http://files.bunchwashington.com/uploads/1/3/0/7/130775808/rivara.pdfIn PDF document text
    • https://site-1039676.mozfiles.com/files/1039676/jopoxakagositota.pdfIn PDF document text
    • https://site-1038892.mozfiles.com/files/1038892/moxidasa.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/18199453611.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/1/0428/7217/6796/files/wikemoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0374/2877/files/atomic_structure_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0360/0286/files/19701743605.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0968/9765/files/periodic_table_puns_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9951/5816/files/nike_hypervenom_liquid_diamond_for_sale.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFD 5188 bytes
SHA-256: 5a743a25f3cf532ae52f01b441a751643d739cf043956ef1c658fd9cb50c8b09
font_01_sfnt_off00005c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8C 13732 bytes
SHA-256: 8721d14778541c3f4021cbfdcf5160af3c24e584ff18daa068226a1ae4d9f2fb
font_02_sfnt_off0000874b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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