Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf7997e97a94517…

MALICIOUS

PDF

37.7 KB Created: 2020-08-19 23:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b319401bf947809977047e09348b52e6 SHA-1: 506f4262cd9366f36d13135b719617e462fa0ca2 SHA-256: 7bf7997e97a94517120cf358eaf1f6d845e0d564b51e7fe79283dd2589963773
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, masquerading as search results for a game, which redirect to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=descargar+bejeweled+2+gratis+para+android. This technique is commonly used to distribute malware or lead users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=descargar+bejeweled+2+gratis+para+android In PDF document text
    • http://files.mistyhollowfarm.net/uploads/1/3/1/3/131379615/ladeva.pdfIn PDF document text
    • http://berojopax.mamamelodrama.com/uploads/1/3/0/8/130873826/magakitewiwari.pdfIn PDF document text
    • http://files.pubsocialmedia.com/uploads/1/3/0/7/130775462/tegofowavozaroju.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/1/0433/0664/7717/files/81894299546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4371/5222/files/pojaduximogoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/burrows_casebook_on_contract_law.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/zesitikuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/5350216506.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/87380737020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/basic_english_grammar_exercises_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/16887569972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/bargarh_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/49756777360.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_off00005366.bin
c6ee6a8c91b1a19121d39a366248a7d81b42ae21eff12edd57cbb2ba10e753fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5366 5680 bytes
font_01_sfnt_off000066e2.bin
219e7fb68601f575a95168fe51e1295ce5d3e4e8e62599c21ac2e772692c9dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E2 10272 bytes

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